diff --git a/contracts/admin-openapi.json b/contracts/admin-openapi.json
index 5e0167b..703b45c 100644
--- a/contracts/admin-openapi.json
+++ b/contracts/admin-openapi.json
@@ -6160,7 +6160,22 @@
                     }
                 },
                 "x-permission": "external-admin-user:create",
-                "x-permissions": ["external-admin-user:create"]
+                "x-permissions": ["external-admin-user:create", "external-admin-user:permissions"]
+            }
+        },
+        "/admin/external-admin-users/permission-catalog": {
+            "get": {
+                "operationId": "listExternalAdminPermissionCatalog",
+                "parameters": [
+                    { "$ref": "#/components/parameters/AppCodeHeader" }
+                ],
+                "responses": {
+                    "200": {
+                        "$ref": "#/components/responses/ExternalAdminPermissionCatalogResponse"
+                    }
+                },
+                "x-permission": "external-admin-user:permissions",
+                "x-permissions": ["external-admin-user:permissions"]
             }
         },
         "/admin/external-admin-users/target": {
@@ -6240,6 +6255,46 @@
                 "x-permissions": ["external-admin-user:reset-password"]
             }
         },
+        "/admin/external-admin-users/{id}/permissions": {
+            "get": {
+                "operationId": "getExternalAdminUserPermissions",
+                "parameters": [
+                    { "$ref": "#/components/parameters/AppCodeHeader" },
+                    { "$ref": "#/components/parameters/Id" }
+                ],
+                "responses": {
+                    "200": {
+                        "$ref": "#/components/responses/ExternalAdminUserPermissionsResponse"
+                    }
+                },
+                "x-permission": "external-admin-user:permissions",
+                "x-permissions": ["external-admin-user:permissions"]
+            },
+            "put": {
+                "operationId": "updateExternalAdminUserPermissions",
+                "parameters": [
+                    { "$ref": "#/components/parameters/AppCodeHeader" },
+                    { "$ref": "#/components/parameters/Id" }
+                ],
+                "requestBody": {
+                    "required": true,
+                    "content": {
+                        "application/json": {
+                            "schema": {
+                                "$ref": "#/components/schemas/ExternalAdminUserPermissionsInput"
+                            }
+                        }
+                    }
+                },
+                "responses": {
+                    "200": {
+                        "$ref": "#/components/responses/ExternalAdminUserResponse"
+                    }
+                },
+                "x-permission": "external-admin-user:permissions",
+                "x-permissions": ["external-admin-user:permissions"]
+            }
+        },
         "/exports/app-users": {
             "post": {
                 "operationId": "appExportUsers",
@@ -8693,6 +8748,22 @@
                     }
                 }
             },
+            "ExternalAdminPermissionCatalogResponse": {
+                "description": "External admin permission catalog",
+                "content": {
+                    "application/json": {
+                        "schema": { "$ref": "#/components/schemas/ApiResponseExternalAdminPermissionCatalog" }
+                    }
+                }
+            },
+            "ExternalAdminUserPermissionsResponse": {
+                "description": "External admin account permissions",
+                "content": {
+                    "application/json": {
+                        "schema": { "$ref": "#/components/schemas/ApiResponseExternalAdminUserPermissions" }
+                    }
+                }
+            },
             "AgencyPageResponse": {
                 "description": "OK",
                 "content": {
@@ -9569,6 +9640,28 @@
                     }
                 ]
             },
+            "ApiResponseExternalAdminPermissionCatalog": {
+                "allOf": [
+                    { "$ref": "#/components/schemas/Envelope" },
+                    {
+                        "type": "object",
+                        "properties": {
+                            "data": { "$ref": "#/components/schemas/ExternalAdminPermissionCatalog" }
+                        }
+                    }
+                ]
+            },
+            "ApiResponseExternalAdminUserPermissions": {
+                "allOf": [
+                    { "$ref": "#/components/schemas/Envelope" },
+                    {
+                        "type": "object",
+                        "properties": {
+                            "data": { "$ref": "#/components/schemas/ExternalAdminUserPermissions" }
+                        }
+                    }
+                ]
+            },
             "ApiPageExternalAdminUser": {
                 "type": "object",
                 "required": ["items", "page", "pageSize", "total"],
@@ -9606,7 +9699,7 @@
             },
             "ExternalAdminUser": {
                 "type": "object",
-                "required": ["id", "appCode", "username", "status", "linkedUser", "permissions", "createdAtMs"],
+                "required": ["id", "appCode", "username", "status", "linkedUser", "permissions", "permissionRevision", "createdAtMs"],
                 "properties": {
                     "id": { "type": "integer" },
                     "appCode": { "type": "string" },
@@ -9617,6 +9710,7 @@
                         "type": "array",
                         "items": { "type": "string" }
                     },
+                    "permissionRevision": { "type": "integer", "format": "int64", "minimum": 1 },
                     "createdByAdminId": { "type": "integer" },
                     "lastLoginAtMs": { "type": "integer", "format": "int64", "nullable": true },
                     "createdAtMs": { "type": "integer", "format": "int64" },
@@ -9635,7 +9729,72 @@
                         "maxLength": 64,
                         "pattern": "^[A-Za-z0-9._-]+$"
                     },
-                    "password": { "type": "string", "minLength": 8, "maxLength": 72 }
+                    "password": { "type": "string", "minLength": 8, "maxLength": 72 },
+                    "permissions": {
+                        "type": "array",
+                        "items": { "type": "string", "minLength": 1 },
+                        "uniqueItems": true
+                    }
+                }
+            },
+            "ExternalAdminPermissionCatalogItem": {
+                "type": "object",
+                "required": ["code", "label", "group", "dependencies", "capabilities", "defaultGranted"],
+                "additionalProperties": false,
+                "properties": {
+                    "code": { "type": "string", "minLength": 1 },
+                    "label": { "type": "string", "minLength": 1 },
+                    "group": { "type": "string", "minLength": 1 },
+                    "dependencies": {
+                        "type": "array",
+                        "items": { "type": "string", "minLength": 1 },
+                        "uniqueItems": true
+                    },
+                    "capabilities": {
+                        "type": "array",
+                        "items": { "type": "string", "minLength": 1 },
+                        "uniqueItems": true
+                    },
+                    "defaultGranted": { "type": "boolean" }
+                }
+            },
+            "ExternalAdminPermissionCatalog": {
+                "type": "object",
+                "required": ["items", "total"],
+                "additionalProperties": false,
+                "properties": {
+                    "items": {
+                        "type": "array",
+                        "items": { "$ref": "#/components/schemas/ExternalAdminPermissionCatalogItem" }
+                    },
+                    "total": { "type": "integer", "minimum": 0 }
+                }
+            },
+            "ExternalAdminUserPermissions": {
+                "type": "object",
+                "required": ["accountId", "permissions", "revision"],
+                "additionalProperties": false,
+                "properties": {
+                    "accountId": { "type": "string", "minLength": 1 },
+                    "permissions": {
+                        "type": "array",
+                        "items": { "type": "string", "minLength": 1 },
+                        "uniqueItems": true
+                    },
+                    "revision": { "type": "integer", "format": "int64", "minimum": 1 }
+                }
+            },
+            "ExternalAdminUserPermissionsInput": {
+                "type": "object",
+                "required": ["permissions", "expectedRevision"],
+                "additionalProperties": false,
+                "properties": {
+                    "permissions": {
+                        "type": "array",
+                        "items": { "type": "string", "minLength": 1 },
+                        "uniqueItems": true
+                    },
+                    "expectedRevision": { "type": "integer", "format": "int64", "minimum": 1 }
                 }
             },
             "ExternalAdminUserStatusInput": {
diff --git a/src/app/permissions.ts b/src/app/permissions.ts
index ea6a475..1035e51 100644
--- a/src/app/permissions.ts
+++ b/src/app/permissions.ts
@@ -63,6 +63,7 @@ export const PERMISSIONS = {
     coinAdjustmentCreate: "coin-adjustment:create",
     externalAdminUserView: "external-admin-user:view",
     externalAdminUserCreate: "external-admin-user:create",
+    externalAdminUserPermissions: "external-admin-user:permissions",
     externalAdminUserStatus: "external-admin-user:status",
     externalAdminUserResetPassword: "external-admin-user:reset-password",
     reportView: "report:view",
diff --git a/src/features/external-admin-users/api.test.ts b/src/features/external-admin-users/api.test.ts
index bc3e742..da4bad5 100644
--- a/src/features/external-admin-users/api.test.ts
+++ b/src/features/external-admin-users/api.test.ts
@@ -2,10 +2,13 @@ import { afterEach, expect, test, vi } from "vitest";
 import { setAccessToken, setSelectedAppCode } from "@/shared/api/request";
 import {
     createExternalAdminUser,
+    getExternalAdminUserPermissions,
     listExternalAdminUsers,
+    listExternalAdminPermissionCatalog,
     lookupExternalAdminUserTarget,
     resetExternalAdminUserPassword,
     updateExternalAdminUserStatus,
+    updateExternalAdminUserPermissions,
 } from "./api";
 
 afterEach(() => {
@@ -14,6 +17,56 @@ afterEach(() => {
     vi.unstubAllGlobals();
 });
 
+test("loads the backend-driven permission catalog and sends an explicit permission snapshot", async () => {
+    vi.stubGlobal(
+        "fetch",
+        vi.fn()
+            .mockResolvedValueOnce(
+                envelope({
+                    items: [
+                        {
+                            capabilities: ["user:list"],
+                            code: "user:list",
+                            defaultGranted: true,
+                            dependencies: [],
+                            group: "用户管理",
+                            label: "用户列表",
+                        },
+                    ],
+                    total: 1,
+                }),
+            )
+            .mockResolvedValueOnce(envelope({ accountId: "71", permissions: ["user:list"], revision: 4 }))
+            .mockResolvedValueOnce(envelope({ ...externalUserFixture(), permissions: [] })),
+    );
+
+    const catalog = await listExternalAdminPermissionCatalog("fami");
+    const current = await getExternalAdminUserPermissions("fami", 71);
+    const updated = await updateExternalAdminUserPermissions("fami", 71, [], 4);
+
+    const calls = vi.mocked(fetch).mock.calls;
+    expect(calls.map(([, init]) => init?.method)).toEqual(["GET", "GET", "PUT"]);
+    expect(String(calls[0][0])).toContain("/api/v1/admin/external-admin-users/permission-catalog");
+    expect(String(calls[1][0])).toContain("/api/v1/admin/external-admin-users/71/permissions");
+    expect(String(calls[2][0])).toContain("/api/v1/admin/external-admin-users/71/permissions");
+    expect(requestBody(calls[2][1])).toEqual({ expectedRevision: 4, permissions: [] });
+    expect(catalog).toEqual({
+        items: [
+            {
+                capabilities: ["user:list"],
+                code: "user:list",
+                defaultGranted: true,
+                dependencies: [],
+                group: "用户管理",
+                label: "用户列表",
+            },
+        ],
+        total: 1,
+    });
+    expect(current).toEqual({ accountId: "71", permissions: ["user:list"], revision: 4 });
+    expect(updated.permissions).toEqual([]);
+});
+
 test("external admin APIs pin every read and write to the explicit App scope", async () => {
     setSelectedAppCode("lalu");
     const externalUser = externalUserFixture();
@@ -76,6 +129,7 @@ test("external admin APIs pin every read and write to the explicit App scope", a
                     userId: "user-1001",
                 },
                 permissions: ["user:list", "room:edit"],
+                permissionRevision: 3,
                 status: "active",
                 username: "ops.fami",
             },
@@ -114,6 +168,7 @@ function externalUserFixture() {
             username: "Fami user",
         },
         permissions: ["user:list", "room:edit"],
+        permission_revision: 3,
         status: "active",
         updated_at_ms: "1784077200000",
         username: "ops.fami",
diff --git a/src/features/external-admin-users/api.ts b/src/features/external-admin-users/api.ts
index e815302..0951492 100644
--- a/src/features/external-admin-users/api.ts
+++ b/src/features/external-admin-users/api.ts
@@ -17,6 +17,7 @@ export interface ExternalAdminUserDto {
     lastLoginAtMs?: number;
     linkedUser: ExternalAdminLinkedUserDto;
     permissions: string[];
+    permissionRevision: number;
     status: ExternalAdminUserStatus;
     updatedAtMs?: number;
     username: string;
@@ -26,8 +27,29 @@ export interface ExternalAdminUserTargetDto extends ExternalAdminLinkedUserDto {
     existingExternalAdminUser?: ExternalAdminUserDto;
 }
 
+export interface ExternalAdminPermissionCatalogItemDto {
+    capabilities: string[];
+    code: string;
+    defaultGranted: boolean;
+    dependencies: string[];
+    group: string;
+    label: string;
+}
+
+export interface ExternalAdminPermissionCatalogDto {
+    items: ExternalAdminPermissionCatalogItemDto[];
+    total: number;
+}
+
+export interface ExternalAdminUserPermissionsDto {
+    accountId: string;
+    permissions: string[];
+    revision: number;
+}
+
 export interface CreateExternalAdminUserPayload {
     password: string;
+    permissions?: string[];
     targetUserId: string;
     username: string;
 }
@@ -58,6 +80,32 @@ export async function lookupExternalAdminUserTarget(
     return normalizeTarget(data);
 }
 
+export async function listExternalAdminPermissionCatalog(
+    appCode: string,
+): Promise<ExternalAdminPermissionCatalogDto> {
+    const endpoint = API_ENDPOINTS.listExternalAdminPermissionCatalog;
+    const data = await apiRequest<RawRecord>(apiEndpointPath(API_OPERATIONS.listExternalAdminPermissionCatalog), {
+        headers: appScopeHeaders(appCode),
+        method: endpoint.method,
+    });
+    return normalizePermissionCatalog(data);
+}
+
+export async function getExternalAdminUserPermissions(
+    appCode: string,
+    id: EntityId,
+): Promise<ExternalAdminUserPermissionsDto> {
+    const endpoint = API_ENDPOINTS.getExternalAdminUserPermissions;
+    const data = await apiRequest<RawRecord>(
+        apiEndpointPath(API_OPERATIONS.getExternalAdminUserPermissions, { id }),
+        {
+            headers: appScopeHeaders(appCode),
+            method: endpoint.method,
+        },
+    );
+    return normalizeUserPermissions(data);
+}
+
 export async function createExternalAdminUser(
     appCode: string,
     payload: CreateExternalAdminUserPayload,
@@ -108,6 +156,24 @@ export async function resetExternalAdminUserPassword(
     return normalizeExternalAdminUser(data);
 }
 
+export async function updateExternalAdminUserPermissions(
+    appCode: string,
+    id: EntityId,
+    permissions: string[],
+    expectedRevision: number,
+): Promise<ExternalAdminUserDto> {
+    const endpoint = API_ENDPOINTS.updateExternalAdminUserPermissions;
+    const data = await apiRequest<RawRecord, { expectedRevision: number; permissions: string[] }>(
+        apiEndpointPath(API_OPERATIONS.updateExternalAdminUserPermissions, { id }),
+        {
+            body: { expectedRevision, permissions },
+            headers: appScopeHeaders(appCode),
+            method: endpoint.method,
+        },
+    );
+    return normalizeExternalAdminUser(data);
+}
+
 function appScopeHeaders(appCode: string) {
     // 外管账号是强 App 隔离数据；显式固定请求头，避免切换 App 后全局请求上下文把写操作送到另一租户。
     return { "X-App-Code": String(appCode || "").trim().toLowerCase() };
@@ -151,6 +217,7 @@ function normalizeExternalAdminUser(raw: RawRecord): ExternalAdminUserDto {
         lastLoginAtMs: optionalNumber(item.lastLoginAtMs ?? item.last_login_at_ms),
         linkedUser,
         permissions: stringArray(item.permissions),
+        permissionRevision: numberValue(item.permissionRevision ?? item.permission_revision),
         status: status === "disabled" ? "disabled" : "active",
         updatedAtMs: optionalNumber(item.updatedAtMs ?? item.updated_at_ms),
         username: stringValue(item.username ?? item.account ?? item.accountName ?? item.account_name),
@@ -178,6 +245,34 @@ function normalizeTarget(raw: RawRecord): ExternalAdminUserTargetDto {
     };
 }
 
+function normalizePermissionCatalog(raw: RawRecord): ExternalAdminPermissionCatalogDto {
+    const item = asRecord(raw) || {};
+    const items = (Array.isArray(item.items) ? item.items : [])
+        .map((entry) => {
+            const permission = asRecord(entry) || {};
+            return {
+                capabilities: stringArray(permission.capabilities),
+                code: stringValue(permission.code),
+                defaultGranted: Boolean(permission.defaultGranted ?? permission.default_granted),
+                dependencies: stringArray(permission.dependencies),
+                group: stringValue(permission.group),
+                label: stringValue(permission.label),
+            };
+        })
+        // 空编码无法用于提交，直接从可选目录剔除，避免 UI 生成不可保存的勾选项。
+        .filter((permission) => permission.code);
+    return { items, total: numberValue(item.total, items.length) };
+}
+
+function normalizeUserPermissions(raw: RawRecord): ExternalAdminUserPermissionsDto {
+    const item = asRecord(raw) || {};
+    return {
+        accountId: stringValue(item.accountId ?? item.account_id),
+        permissions: stringArray(item.permissions),
+        revision: numberValue(item.revision),
+    };
+}
+
 function normalizeUser(raw: RawRecord): ExternalAdminLinkedUserDto {
     const user = asRecord(raw) || {};
     return {
diff --git a/src/features/external-admin-users/components/ExternalAdminPermissionDialogs.test.jsx b/src/features/external-admin-users/components/ExternalAdminPermissionDialogs.test.jsx
new file mode 100644
index 0000000..30c43e1
--- /dev/null
+++ b/src/features/external-admin-users/components/ExternalAdminPermissionDialogs.test.jsx
@@ -0,0 +1,61 @@
+import { cleanup, render, screen } from "@testing-library/react";
+import { afterEach, expect, test, vi } from "vitest";
+import { ExternalAdminPermissionDrawer } from "./ExternalAdminPermissionDrawer.jsx";
+import { ExternalAdminUserFormDialog } from "./ExternalAdminUserFormDialog.jsx";
+
+afterEach(cleanup);
+
+const abilities = { canCreate: true, canManagePermissions: true };
+
+test("disables account creation when a successful permission catalog is empty", () => {
+    render(
+        <ExternalAdminUserFormDialog
+            abilities={abilities}
+            catalog={[]}
+            catalogError=""
+            catalogLoading={false}
+            form={{
+                confirmPassword: "StrongPass123!",
+                displayUserId: "1001",
+                password: "StrongPass123!",
+                permissions: [],
+                username: "ops.fami",
+            }}
+            loading={false}
+            lookupLoading={false}
+            open
+            targetUser={{ displayUserId: "1001", userId: "user-1", username: "Fami user" }}
+            onClose={vi.fn()}
+            onDisplayUserIdChange={vi.fn()}
+            onFormChange={vi.fn()}
+            onLookup={vi.fn()}
+            onReloadCatalog={vi.fn()}
+            onSubmit={vi.fn()}
+        />,
+    );
+
+    expect(screen.getByRole("button", { name: "创建" })).toBeDisabled();
+});
+
+test("disables permission updates when a successful catalog is empty", () => {
+    render(
+        <ExternalAdminPermissionDrawer
+            abilities={abilities}
+            catalog={[]}
+            catalogError=""
+            catalogLoading={false}
+            error=""
+            loading={false}
+            permissions={[]}
+            permissionsLoading={false}
+            user={{ id: 71, username: "ops.fami" }}
+            onChange={vi.fn()}
+            onClose={vi.fn()}
+            onReloadCatalog={vi.fn()}
+            onRetry={vi.fn()}
+            onSubmit={vi.fn()}
+        />,
+    );
+
+    expect(screen.getByRole("button", { name: "保存权限" })).toBeDisabled();
+});
diff --git a/src/features/external-admin-users/components/ExternalAdminPermissionDrawer.jsx b/src/features/external-admin-users/components/ExternalAdminPermissionDrawer.jsx
new file mode 100644
index 0000000..66c354b
--- /dev/null
+++ b/src/features/external-admin-users/components/ExternalAdminPermissionDrawer.jsx
@@ -0,0 +1,60 @@
+import { ExternalAdminPermissionSelector } from "@/features/external-admin-users/components/ExternalAdminPermissionSelector.jsx";
+import styles from "@/features/external-admin-users/external-admin-users.module.css";
+import { Button } from "@/shared/ui/Button.jsx";
+import { SideDrawer } from "@/shared/ui/SideDrawer.jsx";
+
+export function ExternalAdminPermissionDrawer({
+    abilities,
+    catalog,
+    catalogError,
+    catalogLoading,
+    error,
+    loading,
+    onChange,
+    onClose,
+    onReloadCatalog,
+    onRetry,
+    onSubmit,
+    permissions,
+    permissionsLoading,
+    user,
+}) {
+    const open = Boolean(user);
+    const unavailable = Boolean(
+        !catalog.length || catalogError || error || catalogLoading || permissionsLoading || loading,
+    );
+
+    return (
+        <SideDrawer
+            actions={
+                <>
+                    <Button disabled={loading} onClick={onClose}>
+                        取消
+                    </Button>
+                    <Button
+                        disabled={!abilities.canManagePermissions || unavailable}
+                        variant="primary"
+                        onClick={onSubmit}
+                    >
+                        {loading ? "保存中" : "保存权限"}
+                    </Button>
+                </>
+            }
+            contentClassName={styles.permissionDrawerBody}
+            open={open}
+            title={`配置权限${user?.username ? ` · ${user.username}` : ""}`}
+            width="detail"
+            onClose={onClose}
+        >
+            <ExternalAdminPermissionSelector
+                catalog={catalog}
+                disabled={!abilities.canManagePermissions || loading}
+                error={catalogError || error}
+                loading={catalogLoading || permissionsLoading}
+                value={permissions}
+                onChange={onChange}
+                onRetry={catalogError ? onReloadCatalog : error ? onRetry : undefined}
+            />
+        </SideDrawer>
+    );
+}
diff --git a/src/features/external-admin-users/components/ExternalAdminPermissionSelector.jsx b/src/features/external-admin-users/components/ExternalAdminPermissionSelector.jsx
new file mode 100644
index 0000000..ff822d1
--- /dev/null
+++ b/src/features/external-admin-users/components/ExternalAdminPermissionSelector.jsx
@@ -0,0 +1,144 @@
+import Checkbox from "@mui/material/Checkbox";
+import CircularProgress from "@mui/material/CircularProgress";
+import { useMemo } from "react";
+import { Button } from "@/shared/ui/Button.jsx";
+import styles from "@/features/external-admin-users/external-admin-users.module.css";
+import {
+    updatePermissionGroup,
+    updatePermissionSelection,
+} from "@/features/external-admin-users/permissionSelection.js";
+
+export { updatePermissionSelection } from "@/features/external-admin-users/permissionSelection.js";
+
+export function ExternalAdminPermissionSelector({
+    catalog = [],
+    disabled = false,
+    error = "",
+    loading = false,
+    onChange,
+    onRetry,
+    value = [],
+}) {
+    const groups = useMemo(() => groupCatalog(catalog), [catalog]);
+    const knownCodes = useMemo(() => catalog.map((permission) => permission.code), [catalog]);
+    const selected = useMemo(() => new Set(value), [value]);
+    const selectedCount = knownCodes.filter((code) => selected.has(code)).length;
+
+    if (loading) {
+        return (
+            <div className={styles.permissionState} role="status">
+                <CircularProgress size={22} />
+                <span>加载权限目录</span>
+            </div>
+        );
+    }
+
+    if (error) {
+        return (
+            <div className={styles.permissionState} role="alert">
+                <span>{error}</span>
+                {onRetry ? <Button onClick={onRetry}>重新加载</Button> : null}
+            </div>
+        );
+    }
+
+    return (
+        <div className={styles.permissionSelector}>
+            <div className={styles.permissionToolbar}>
+                <strong>
+                    已选 {selectedCount} / {knownCodes.length} 项
+                </strong>
+                <div className={styles.permissionToolbarActions}>
+                    <Button
+                        disabled={disabled || selectedCount === knownCodes.length}
+                        onClick={() => onChange?.(knownCodes)}
+                    >
+                        全选
+                    </Button>
+                    <Button disabled={disabled || selectedCount === 0} onClick={() => onChange?.([])}>
+                        清空
+                    </Button>
+                </div>
+            </div>
+
+            {groups.length ? (
+                <div className={styles.permissionGroups}>
+                    {groups.map((group) => {
+                        const groupCodes = group.items.map((permission) => permission.code);
+                        const groupSelectedCount = groupCodes.filter((code) => selected.has(code)).length;
+                        return (
+                            <section className={styles.permissionGroup} key={group.name}>
+                                <header className={styles.permissionGroupHeader}>
+                                    <strong>{group.name}</strong>
+                                    <label>
+                                        <Checkbox
+                                            checked={groupSelectedCount === groupCodes.length}
+                                            disabled={disabled}
+                                            indeterminate={groupSelectedCount > 0 && groupSelectedCount < groupCodes.length}
+                                            slotProps={{ input: { "aria-label": `${group.name}全选` } }}
+                                            size="small"
+                                            onChange={(event) =>
+                                                onChange?.(
+                                                    updatePermissionGroup(
+                                                        catalog,
+                                                        value,
+                                                        groupCodes,
+                                                        event.target.checked,
+                                                    ),
+                                                )
+                                            }
+                                        />
+                                        <span>
+                                            {groupSelectedCount}/{groupCodes.length}
+                                        </span>
+                                    </label>
+                                </header>
+                                <div className={styles.permissionOptions}>
+                                    {group.items.map((permission) => {
+                                        return (
+                                            <label className={styles.permissionOption} key={permission.code}>
+                                                <Checkbox
+                                                    checked={selected.has(permission.code)}
+                                                    disabled={disabled}
+                                                    slotProps={{ input: { "aria-label": permission.label } }}
+                                                    size="small"
+                                                    onChange={(event) =>
+                                                        onChange?.(
+                                                            updatePermissionSelection(
+                                                                catalog,
+                                                                value,
+                                                                permission.code,
+                                                                event.target.checked,
+                                                            ),
+                                                        )
+                                                    }
+                                                />
+                                                <span>
+                                                    <strong>{permission.label}</strong>
+                                                </span>
+                                            </label>
+                                        );
+                                    })}
+                                </div>
+                            </section>
+                        );
+                    })}
+                </div>
+            ) : (
+                <div className={styles.permissionState}>当前无可配置权限</div>
+            )}
+        </div>
+    );
+}
+
+function groupCatalog(catalog) {
+    const groups = new Map();
+    catalog.forEach((permission) => {
+        const groupName = permission.group || "其他";
+        if (!groups.has(groupName)) {
+            groups.set(groupName, []);
+        }
+        groups.get(groupName).push(permission);
+    });
+    return [...groups].map(([name, items]) => ({ items, name }));
+}
diff --git a/src/features/external-admin-users/components/ExternalAdminPermissionSelector.test.jsx b/src/features/external-admin-users/components/ExternalAdminPermissionSelector.test.jsx
new file mode 100644
index 0000000..43cb0a3
--- /dev/null
+++ b/src/features/external-admin-users/components/ExternalAdminPermissionSelector.test.jsx
@@ -0,0 +1,60 @@
+import { fireEvent, render, screen } from "@testing-library/react";
+import { describe, expect, test, vi } from "vitest";
+import {
+    ExternalAdminPermissionSelector,
+    updatePermissionSelection,
+} from "./ExternalAdminPermissionSelector.jsx";
+import { defaultPermissionSelection } from "@/features/external-admin-users/permissionSelection.js";
+
+const catalog = [
+    { code: "user:list", dependencies: [], group: "用户管理", label: "用户列表" },
+    { code: "user:update", dependencies: ["user:list"], group: "用户管理", label: "编辑用户" },
+    { code: "room:list", dependencies: [], group: "房间管理", label: "房间列表" },
+];
+
+describe("ExternalAdminPermissionSelector", () => {
+    test("adds required permissions and removes actions whose dependency is cleared", () => {
+        expect(updatePermissionSelection(catalog, [], "user:update", true)).toEqual(["user:list", "user:update"]);
+        expect(
+            updatePermissionSelection(catalog, ["user:list", "user:update", "room:list"], "user:list", false),
+        ).toEqual(["room:list"]);
+    });
+
+    test("expands dependencies declared by default-granted catalog entries", () => {
+        expect(
+            defaultPermissionSelection([
+                { code: "user:list", defaultGranted: false, dependencies: [] },
+                { code: "user:update", defaultGranted: true, dependencies: ["user:list"] },
+            ]),
+        ).toEqual(["user:list", "user:update"]);
+    });
+
+    test("resolves cyclic dependencies without recursion or removal loops", () => {
+        const cyclicCatalog = [
+            { code: "level:view", dependencies: ["vip:view"], group: "等级", label: "等级" },
+            { code: "vip:view", dependencies: ["level:view"], group: "等级", label: "VIP" },
+        ];
+
+        expect(updatePermissionSelection(cyclicCatalog, [], "level:view", true)).toEqual([
+            "level:view",
+            "vip:view",
+        ]);
+        expect(updatePermissionSelection(cyclicCatalog, ["level:view", "vip:view"], "level:view", false)).toEqual([]);
+    });
+
+    test("renders backend groups and supports explicit select all and clear", () => {
+        const onChange = vi.fn();
+        const { rerender } = render(
+            <ExternalAdminPermissionSelector catalog={catalog} onChange={onChange} value={["user:list"]} />,
+        );
+
+        expect(screen.getByText("已选 1 / 3 项")).toBeInTheDocument();
+        expect(screen.getByText("用户管理")).toBeInTheDocument();
+        fireEvent.click(screen.getByRole("button", { name: "全选" }));
+        expect(onChange).toHaveBeenLastCalledWith(["user:list", "user:update", "room:list"]);
+
+        rerender(<ExternalAdminPermissionSelector catalog={catalog} onChange={onChange} value={catalog.map((item) => item.code)} />);
+        fireEvent.click(screen.getByRole("button", { name: "清空" }));
+        expect(onChange).toHaveBeenLastCalledWith([]);
+    });
+});
diff --git a/src/features/external-admin-users/components/ExternalAdminUserFormDialog.jsx b/src/features/external-admin-users/components/ExternalAdminUserFormDialog.jsx
index ce0a679..1d071d8 100644
--- a/src/features/external-admin-users/components/ExternalAdminUserFormDialog.jsx
+++ b/src/features/external-admin-users/components/ExternalAdminUserFormDialog.jsx
@@ -8,9 +8,13 @@ import {
 } from "@/shared/ui/AdminFormDialog.jsx";
 import { AdminUserIdentity } from "@/shared/ui/AdminUserIdentity.jsx";
 import styles from "@/features/external-admin-users/external-admin-users.module.css";
+import { ExternalAdminPermissionSelector } from "@/features/external-admin-users/components/ExternalAdminPermissionSelector.jsx";
 
 export function ExternalAdminUserFormDialog({
     abilities,
+    catalog,
+    catalogError,
+    catalogLoading,
     form,
     loading,
     lookupLoading,
@@ -18,6 +22,7 @@ export function ExternalAdminUserFormDialog({
     onDisplayUserIdChange,
     onFormChange,
     onLookup,
+    onReloadCatalog,
     onSubmit,
     open,
     targetUser,
@@ -30,7 +35,14 @@ export function ExternalAdminUserFormDialog({
             loading={loading}
             open={open}
             size="large"
-            submitDisabled={!abilities.canCreate || loading || !targetUser?.userId || Boolean(existingAccount)}
+            submitDisabled={
+                !abilities.canCreate ||
+                loading ||
+                !targetUser?.userId ||
+                Boolean(existingAccount) ||
+                (abilities.canManagePermissions &&
+                    (catalogLoading || Boolean(catalogError) || !catalog.length))
+            }
             submitLabel="创建"
             title="创建外管用户"
             onClose={onClose}
@@ -108,6 +120,20 @@ export function ExternalAdminUserFormDialog({
                     />
                 </AdminFormFieldGrid>
             </AdminFormSection>
+
+            {abilities.canManagePermissions ? (
+                <AdminFormSection title="外管权限">
+                    <ExternalAdminPermissionSelector
+                        catalog={catalog}
+                        disabled={loading}
+                        error={catalogError}
+                        loading={catalogLoading}
+                        value={form.permissions || []}
+                        onChange={(permissions) => onFormChange({ permissions })}
+                        onRetry={onReloadCatalog}
+                    />
+                </AdminFormSection>
+            ) : null}
         </AdminFormDialog>
     );
 }
diff --git a/src/features/external-admin-users/external-admin-users.module.css b/src/features/external-admin-users/external-admin-users.module.css
index 35ff7ed..7ff1a6b 100644
--- a/src/features/external-admin-users/external-admin-users.module.css
+++ b/src/features/external-admin-users/external-admin-users.module.css
@@ -50,6 +50,137 @@
     white-space: nowrap;
 }
 
+.permissionSelector {
+    display: grid;
+    min-width: 0;
+    gap: var(--space-3);
+}
+
+.permissionToolbar {
+    display: flex;
+    min-height: var(--control-height);
+    align-items: center;
+    justify-content: space-between;
+    gap: var(--space-3);
+}
+
+.permissionToolbar > strong {
+    color: var(--text-primary);
+    font-size: var(--control-font-size);
+}
+
+.permissionToolbarActions {
+    display: flex;
+    align-items: center;
+    gap: var(--space-2);
+}
+
+.permissionToolbarActions :global(.MuiButton-root) {
+    min-width: 64px;
+}
+
+.permissionGroups {
+    display: grid;
+    gap: var(--space-3);
+}
+
+.permissionGroup {
+    overflow: hidden;
+    border: 1px solid var(--border);
+    border-radius: var(--radius-control);
+    background: var(--bg-card);
+}
+
+.permissionGroupHeader {
+    display: flex;
+    min-height: 44px;
+    align-items: center;
+    justify-content: space-between;
+    gap: var(--space-3);
+    padding: 0 var(--space-3);
+    border-bottom: 1px solid var(--border-soft);
+    background: var(--bg-card-strong);
+}
+
+.permissionGroupHeader > strong {
+    color: var(--text-primary);
+    font-size: var(--control-font-size);
+}
+
+.permissionGroupHeader label {
+    display: flex;
+    align-items: center;
+    gap: var(--space-1);
+    color: var(--text-tertiary);
+    font-size: 12px;
+    font-variant-numeric: tabular-nums;
+}
+
+.permissionOptions {
+    display: grid;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    gap: var(--space-2);
+    padding: var(--space-3);
+}
+
+.permissionOption {
+    display: flex;
+    min-width: 0;
+    min-height: 48px;
+    align-items: center;
+    gap: var(--space-1);
+    padding: var(--space-2);
+    border: 1px solid var(--border);
+    border-radius: var(--radius-control);
+    background: var(--bg-card-strong);
+    cursor: pointer;
+    transition:
+        border-color var(--motion-fast) var(--ease-standard),
+        background var(--motion-fast) var(--ease-standard),
+        transform var(--motion-base) var(--ease-emphasized);
+}
+
+.permissionOption:hover {
+    border-color: var(--primary-border-strong);
+    background: var(--primary-hover);
+}
+
+.permissionOption:active {
+    transform: scale(0.99);
+}
+
+.permissionOption > span {
+    min-width: 0;
+}
+
+.permissionOption strong {
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
+.permissionOption strong {
+    color: var(--text-primary);
+    font-size: var(--control-font-size);
+}
+
+.permissionState {
+    display: grid;
+    min-height: 150px;
+    place-items: center;
+    align-content: center;
+    gap: var(--space-3);
+    padding: var(--space-4);
+    border: 1px solid var(--border);
+    border-radius: var(--radius-control);
+    color: var(--text-tertiary);
+    text-align: center;
+}
+
+.permissionDrawerBody {
+    align-content: start;
+}
+
 @media (max-width: 760px) {
     .lookupRow {
         grid-template-columns: 1fr;
@@ -58,4 +189,24 @@
     .lookupButton {
         width: 100%;
     }
+
+    .permissionToolbar {
+        align-items: flex-start;
+        flex-direction: column;
+    }
+
+    .permissionToolbarActions,
+    .permissionToolbarActions :global(.MuiButton-root) {
+        width: 100%;
+    }
+
+    .permissionOptions {
+        grid-template-columns: 1fr;
+    }
+}
+
+@media (prefers-reduced-motion: reduce) {
+    .permissionOption {
+        transition: none;
+    }
 }
diff --git a/src/features/external-admin-users/hooks/useExternalAdminUsersPage.js b/src/features/external-admin-users/hooks/useExternalAdminUsersPage.js
index 4584d50..84f78c8 100644
--- a/src/features/external-admin-users/hooks/useExternalAdminUsersPage.js
+++ b/src/features/external-admin-users/hooks/useExternalAdminUsersPage.js
@@ -3,16 +3,21 @@ import { useQueryClient } from "@tanstack/react-query";
 import { useAppScope } from "@/app/app-scope/AppScopeProvider.jsx";
 import {
     createExternalAdminUser,
+    getExternalAdminUserPermissions,
     listExternalAdminUsers,
+    listExternalAdminPermissionCatalog,
     lookupExternalAdminUserTarget,
     resetExternalAdminUserPassword,
+    updateExternalAdminUserPermissions,
     updateExternalAdminUserStatus,
 } from "@/features/external-admin-users/api";
 import { useExternalAdminUserAbilities } from "@/features/external-admin-users/permissions.js";
+import { defaultPermissionSelection } from "@/features/external-admin-users/permissionSelection.js";
 import {
     externalAdminUserCreateFormSchema,
     externalAdminUserLookupSchema,
     externalAdminUserPasswordFormSchema,
+    externalAdminUserPermissionsFormSchema,
 } from "@/features/external-admin-users/schema";
 import { toPageQuery } from "@/shared/api/query";
 import { parseForm } from "@/shared/forms/validation";
@@ -23,8 +28,9 @@ import { useToast } from "@/shared/ui/ToastProvider.jsx";
 
 const pageSize = 50;
 const emptyPage = { items: [], page: 1, pageSize, total: 0 };
-const emptyCreateForm = () => ({ confirmPassword: "", displayUserId: "", password: "", username: "" });
+const emptyCreateForm = () => ({ confirmPassword: "", displayUserId: "", password: "", permissions: [], username: "" });
 const emptyPasswordForm = () => ({ confirmPassword: "", password: "" });
+const emptyPermissionCatalog = { items: [], total: 0 };
 
 export function useExternalAdminUsersPage() {
     const { appCode } = useAppScope();
@@ -34,6 +40,7 @@ export function useExternalAdminUsersPage() {
     const { showToast } = useToast();
     const currentAppCodeRef = useRef(appCode);
     const lookupRequestRef = useRef(0);
+    const permissionRequestRef = useRef(0);
 
     const [keyword, setKeywordState] = useState("");
     const [status, setStatusState] = useState("");
@@ -43,10 +50,15 @@ export function useExternalAdminUsersPage() {
     const [createForm, setCreateFormState] = useState(emptyCreateForm);
     const [targetUser, setTargetUser] = useState(null);
     const [lookupLoading, setLookupLoading] = useState(false);
+    const [createPermissionsReady, setCreatePermissionsReady] = useState(false);
     const [passwordUser, setPasswordUser] = useState(null);
     const [passwordForm, setPasswordFormState] = useState(emptyPasswordForm);
     const [actionAppCode, setActionAppCode] = useState("");
     const [loadingAction, setLoadingAction] = useState("");
+    const [permissionUser, setPermissionUser] = useState(null);
+    const [permissionForm, setPermissionFormState] = useState({ expectedRevision: null, permissions: [] });
+    const [permissionLoading, setPermissionLoading] = useState(false);
+    const [permissionError, setPermissionError] = useState("");
 
     const requestQuery = useMemo(
         () => toPageQuery({ keyword, page, pageSize, status }),
@@ -64,6 +76,22 @@ export function useExternalAdminUsersPage() {
         initialData: emptyPage,
         queryKey: ["external-admin-users", appCode, requestQuery],
     });
+    const catalogQueryFn = useCallback(() => listExternalAdminPermissionCatalog(appCode), [appCode]);
+    const {
+        data: permissionCatalog = emptyPermissionCatalog,
+        error: catalogQueryError,
+        loading: catalogLoading,
+        reload: reloadPermissionCatalog,
+    } = useAdminQuery(catalogQueryFn, {
+        enabled: Boolean(appCode && abilities.canManagePermissions),
+        errorMessage: "加载外管权限目录失败",
+        initialData: emptyPermissionCatalog,
+        queryKey: ["external-admin-permission-catalog", appCode],
+        staleTime: 5 * 60 * 1000,
+    });
+    const catalogEmpty =
+        abilities.canManagePermissions && !catalogLoading && !catalogQueryError && permissionCatalog.items.length === 0;
+    const catalogError = catalogQueryError || (catalogEmpty ? "外管权限目录为空，请联系管理员" : "");
 
     useLayoutEffect(() => {
         // 写操作完成回调依赖最新租户；布局 effect 在用户能继续交互前同步边界，又不在渲染阶段读写 ref。
@@ -73,20 +101,51 @@ export function useExternalAdminUsersPage() {
     useEffect(() => {
         // App 是外管账号的租户边界；切换后必须立即丢弃账号、密码和用户匹配结果，禁止跨 App 复用敏感表单。
         lookupRequestRef.current += 1;
+        permissionRequestRef.current += 1;
         setCreateOpen(false);
         setCreateFormState(emptyCreateForm());
+        setCreatePermissionsReady(false);
         setTargetUser(null);
         setLookupLoading(false);
         setPasswordUser(null);
         setPasswordFormState(emptyPasswordForm());
         setActionAppCode("");
         setLoadingAction("");
+        setPermissionUser(null);
+        setPermissionFormState({ expectedRevision: null, permissions: [] });
+        setPermissionLoading(false);
+        setPermissionError("");
         setKeywordState("");
         setStatusState("");
         setPage(1);
         setMergedPage({ ...emptyPage, appCode });
     }, [appCode]);
 
+    useEffect(() => {
+        if (
+            !createOpen ||
+            !abilities.canManagePermissions ||
+            createPermissionsReady ||
+            catalogLoading ||
+            catalogError
+        ) {
+            return;
+        }
+        // 默认值完全由目录声明，避免前端把未来新增的高风险能力自动授权；即使默认集合为空，也显式保留 []。
+        setCreateFormState((current) => ({
+            ...current,
+            permissions: defaultPermissionSelection(permissionCatalog.items || []),
+        }));
+        setCreatePermissionsReady(true);
+    }, [
+        abilities.canManagePermissions,
+        catalogError,
+        catalogLoading,
+        createOpen,
+        createPermissionsReady,
+        permissionCatalog.items,
+    ]);
+
     useEffect(() => {
         setMergedPage({ ...emptyPage, appCode });
     }, [appCode, keyword, status]);
@@ -134,6 +193,9 @@ export function useExternalAdminUsersPage() {
     };
 
     const setCreateForm = (patch) => {
+        if (Object.prototype.hasOwnProperty.call(patch, "permissions")) {
+            setCreatePermissionsReady(true);
+        }
         setCreateFormState((current) => ({ ...current, ...patch }));
     };
     const changeDisplayUserId = (value) => {
@@ -144,7 +206,15 @@ export function useExternalAdminUsersPage() {
     };
     const openCreate = () => {
         lookupRequestRef.current += 1;
-        setCreateFormState(emptyCreateForm());
+        const catalogReady = !catalogLoading && !catalogError;
+        setCreateFormState({
+            ...emptyCreateForm(),
+            permissions:
+                abilities.canManagePermissions && catalogReady
+                    ? defaultPermissionSelection(permissionCatalog.items || [])
+                    : [],
+        });
+        setCreatePermissionsReady(!abilities.canManagePermissions || catalogReady);
         setTargetUser(null);
         setLookupLoading(false);
         setActionAppCode(appCode);
@@ -157,6 +227,7 @@ export function useExternalAdminUsersPage() {
         lookupRequestRef.current += 1;
         setCreateOpen(false);
         setCreateFormState(emptyCreateForm());
+        setCreatePermissionsReady(false);
         setTargetUser(null);
         setLookupLoading(false);
         setActionAppCode("");
@@ -206,6 +277,10 @@ export function useExternalAdminUsersPage() {
     const submitCreate = async (event) => {
         event.preventDefault();
         const scope = actionAppCode;
+        if (!abilities.canCreate) {
+            showToast("没有创建外管用户的权限", "error");
+            return;
+        }
         if (!scope || scope !== appCode) {
             showToast("应用已切换，请重新创建", "error");
             return;
@@ -218,6 +293,10 @@ export function useExternalAdminUsersPage() {
             showToast("该 App 用户已绑定外管账号", "error");
             return;
         }
+        if (catalogLoading || catalogError || permissionCatalog.items.length === 0) {
+            showToast(catalogError || "外管权限目录尚未加载", "error");
+            return;
+        }
         let formPayload;
         try {
             formPayload = parseForm(externalAdminUserCreateFormSchema, createForm);
@@ -230,6 +309,8 @@ export function useExternalAdminUsersPage() {
         try {
             await createExternalAdminUser(scope, {
                 password: formPayload.password,
+                // 创建权限已收口为 create + permissions，始终提交显式快照，[] 表示主动创建零权限账号。
+                permissions: formPayload.permissions || [],
                 // 始终提交查询接口返回的稳定 userId，短 ID / 靓号只用于定位，避免后续改号造成错误绑定。
                 targetUserId: targetUser.userId,
                 username: formPayload.username,
@@ -239,6 +320,7 @@ export function useExternalAdminUsersPage() {
             }
             setCreateOpen(false);
             setCreateFormState(emptyCreateForm());
+            setCreatePermissionsReady(false);
             setTargetUser(null);
             setActionAppCode("");
             showToast("外管用户已创建", "success");
@@ -341,10 +423,121 @@ export function useExternalAdminUsersPage() {
         }
     };
 
+    const loadPermissions = useCallback(
+        async (item, scope = appCode) => {
+            const requestId = permissionRequestRef.current + 1;
+            permissionRequestRef.current = requestId;
+            setPermissionLoading(true);
+            setPermissionError("");
+            try {
+                const result = await getExternalAdminUserPermissions(scope, item.id);
+                if (currentAppCodeRef.current !== scope || permissionRequestRef.current !== requestId) {
+                    return;
+                }
+                setPermissionFormState({
+                    // 详情和目录可能并发返回，先保留服务端快照；提交边界再按届时已加载的目录过滤。
+                    expectedRevision: result.revision,
+                    permissions: result.permissions,
+                });
+            } catch (err) {
+                if (currentAppCodeRef.current === scope && permissionRequestRef.current === requestId) {
+                    setPermissionError(err.message || "加载账号权限失败");
+                }
+            } finally {
+                if (currentAppCodeRef.current === scope && permissionRequestRef.current === requestId) {
+                    setPermissionLoading(false);
+                }
+            }
+        },
+        [appCode],
+    );
+
+    const openPermissions = (item) => {
+        setPermissionUser(item);
+        setPermissionFormState({ expectedRevision: null, permissions: [] });
+        setPermissionError("");
+        setActionAppCode(appCode);
+        void loadPermissions(item, appCode);
+    };
+    const closePermissions = () => {
+        if (loadingAction.startsWith("permissions:")) {
+            return;
+        }
+        permissionRequestRef.current += 1;
+        setPermissionUser(null);
+        setPermissionFormState({ expectedRevision: null, permissions: [] });
+        setPermissionLoading(false);
+        setPermissionError("");
+        setActionAppCode("");
+    };
+    const retryPermissions = () => {
+        if (permissionUser) {
+            void loadPermissions(permissionUser, actionAppCode || appCode);
+        }
+    };
+    const setPermissions = (permissions) => {
+        setPermissionFormState((current) => ({ ...current, permissions }));
+    };
+    const submitPermissions = async () => {
+        const scope = actionAppCode;
+        const item = permissionUser;
+        if (!abilities.canManagePermissions) {
+            showToast("没有配置外管权限的权限", "error");
+            return;
+        }
+        if (!item || !scope || scope !== appCode) {
+            showToast("应用已切换，请重新操作", "error");
+            return;
+        }
+        if (catalogLoading || catalogError || permissionCatalog.items.length === 0) {
+            showToast(catalogError || "外管权限目录尚未加载", "error");
+            return;
+        }
+        let payload;
+        try {
+            payload = parseForm(externalAdminUserPermissionsFormSchema, permissionForm);
+        } catch (err) {
+            showToast(err.message || "权限参数不正确", "error");
+            return;
+        }
+        const knownCodes = new Set((permissionCatalog.items || []).map((permission) => permission.code));
+        const permissions = payload.permissions.filter((permission) => knownCodes.has(permission));
+
+        setPermissionError("");
+        setLoadingAction(`permissions:${item.id}`);
+        try {
+            // 目录是允许写入的唯一边界；被服务端下线的旧编码不应在本次编辑中重新写回。
+            await updateExternalAdminUserPermissions(scope, item.id, permissions, payload.expectedRevision);
+            if (currentAppCodeRef.current !== scope) {
+                return;
+            }
+            setPermissionUser(null);
+            setPermissionFormState({ expectedRevision: null, permissions: [] });
+            setPermissionError("");
+            setActionAppCode("");
+            showToast("权限已更新，该账号需重新登录", "success");
+            await refreshList(scope);
+        } catch (err) {
+            if (currentAppCodeRef.current === scope) {
+                const message =
+                    Number(err?.status) === 409
+                        ? "账号权限已被更新，请重新加载"
+                        : "更新外管权限失败";
+                setPermissionError(message);
+                showToast(message, "error");
+            }
+        } finally {
+            if (currentAppCodeRef.current === scope) {
+                setLoadingAction("");
+            }
+        }
+    };
+
     return {
         abilities,
         closeCreate,
         closePassword,
+        closePermissions,
         createForm,
         createOpen,
         data,
@@ -356,21 +549,33 @@ export function useExternalAdminUsersPage() {
         lookupTarget,
         openCreate,
         openPassword,
+        openPermissions,
         page,
         pageSize,
         passwordForm,
         passwordUser,
+        permissionCatalog,
+        permissionError,
+        permissionForm,
+        permissionLoading,
+        permissionUser,
+        catalogError,
+        catalogLoading,
         reload,
         resetFilters,
+        reloadPermissionCatalog,
+        retryPermissions,
         setCreateForm,
         setDisplayUserId: changeDisplayUserId,
         setKeyword,
         setPage,
         setPasswordForm,
+        setPermissions,
         setStatus,
         status,
         submitCreate,
         submitPassword,
+        submitPermissions,
         targetUser,
         toggleStatus,
     };
diff --git a/src/features/external-admin-users/hooks/useExternalAdminUsersPage.test.jsx b/src/features/external-admin-users/hooks/useExternalAdminUsersPage.test.jsx
index 1e25d6e..2a4e886 100644
--- a/src/features/external-admin-users/hooks/useExternalAdminUsersPage.test.jsx
+++ b/src/features/external-admin-users/hooks/useExternalAdminUsersPage.test.jsx
@@ -2,12 +2,18 @@ import { act, renderHook, waitFor } from "@testing-library/react";
 import { afterEach, beforeEach, expect, test, vi } from "vitest";
 
 const mocks = vi.hoisted(() => ({
-    abilities: { canCreate: true, canResetPassword: true, canStatus: true, canView: true },
+    abilities: { canCreate: true, canManagePermissions: true, canResetPassword: true, canStatus: true, canView: true },
     appCode: "fami",
+    catalogError: "",
+    catalogLoading: false,
+    catalogPage: null,
+    catalogQueryOptions: null,
     confirm: vi.fn(),
     createExternalAdminUser: vi.fn(),
+    getExternalAdminUserPermissions: vi.fn(),
     invalidateQueries: vi.fn(),
     listExternalAdminUsers: vi.fn(),
+    listExternalAdminPermissionCatalog: vi.fn(),
     lookupExternalAdminUserTarget: vi.fn(),
     queryOptions: null,
     queryPage: { items: [], page: 1, pageSize: 50, total: 0 },
@@ -15,6 +21,7 @@ const mocks = vi.hoisted(() => ({
     resetExternalAdminUserPassword: vi.fn(),
     showToast: vi.fn(),
     updateExternalAdminUserStatus: vi.fn(),
+    updateExternalAdminUserPermissions: vi.fn(),
 }));
 
 vi.mock("@tanstack/react-query", () => ({
@@ -27,10 +34,13 @@ vi.mock("@/app/app-scope/AppScopeProvider.jsx", () => ({
 
 vi.mock("@/features/external-admin-users/api", () => ({
     createExternalAdminUser: mocks.createExternalAdminUser,
+    getExternalAdminUserPermissions: mocks.getExternalAdminUserPermissions,
     listExternalAdminUsers: mocks.listExternalAdminUsers,
+    listExternalAdminPermissionCatalog: mocks.listExternalAdminPermissionCatalog,
     lookupExternalAdminUserTarget: mocks.lookupExternalAdminUserTarget,
     resetExternalAdminUserPassword: mocks.resetExternalAdminUserPassword,
     updateExternalAdminUserStatus: mocks.updateExternalAdminUserStatus,
+    updateExternalAdminUserPermissions: mocks.updateExternalAdminUserPermissions,
 }));
 
 vi.mock("@/features/external-admin-users/permissions.js", () => ({
@@ -40,6 +50,18 @@ vi.mock("@/features/external-admin-users/permissions.js", () => ({
 vi.mock("@/shared/hooks/useAdminQuery.js", () => ({
     useAdminQuery: (_queryFn, options) => {
         mocks.queryOptions = options;
+        if (options.queryKey[0] === "external-admin-permission-catalog") {
+            mocks.catalogQueryOptions = options;
+            if (options.enabled) {
+                void _queryFn();
+            }
+            return {
+                data: mocks.catalogPage,
+                error: mocks.catalogError,
+                loading: mocks.catalogLoading,
+                reload: mocks.reload,
+            };
+        }
         return { data: mocks.queryPage, error: "", loading: false, reload: mocks.reload };
     },
 }));
@@ -55,15 +77,26 @@ vi.mock("@/shared/ui/ToastProvider.jsx", () => ({
 import { useExternalAdminUsersPage } from "./useExternalAdminUsersPage.js";
 
 beforeEach(() => {
+    mocks.abilities = { canCreate: true, canManagePermissions: true, canResetPassword: true, canStatus: true, canView: true };
     mocks.appCode = "fami";
+    mocks.catalogError = "";
+    mocks.catalogLoading = false;
+    mocks.catalogPage = permissionCatalogFixture();
     mocks.queryPage = { items: [], page: 1, pageSize: 50, total: 0 };
     mocks.confirm.mockResolvedValue(true);
     mocks.createExternalAdminUser.mockResolvedValue(externalUserFixture());
+    mocks.listExternalAdminPermissionCatalog.mockResolvedValue(permissionCatalogFixture());
+    mocks.getExternalAdminUserPermissions.mockResolvedValue({
+        accountId: "71",
+        permissions: ["user:list"],
+        revision: 4,
+    });
     mocks.invalidateQueries.mockResolvedValue(undefined);
     mocks.lookupExternalAdminUserTarget.mockResolvedValue(targetFixture());
     mocks.reload.mockResolvedValue(undefined);
     mocks.resetExternalAdminUserPassword.mockResolvedValue(externalUserFixture());
     mocks.updateExternalAdminUserStatus.mockResolvedValue({ ...externalUserFixture(), status: "disabled" });
+    mocks.updateExternalAdminUserPermissions.mockResolvedValue(externalUserFixture());
 });
 
 afterEach(() => {
@@ -88,6 +121,7 @@ test("creates an App-scoped account with the canonical userId returned by lookup
     expect(mocks.lookupExternalAdminUserTarget).toHaveBeenCalledWith("fami", "VIP-1001");
     expect(mocks.createExternalAdminUser).toHaveBeenCalledWith("fami", {
         password: "StrongPass123!",
+        permissions: ["user:list", "user:update"],
         targetUserId: "internal-user-1001",
         username: "ops.fami",
     });
@@ -95,6 +129,67 @@ test("creates an App-scoped account with the canonical userId returned by lookup
     expect(result.current.createOpen).toBe(false);
 });
 
+test("creates an explicit zero-permission account after the operator clears defaults", async () => {
+    const { result } = renderHook(() => useExternalAdminUsersPage());
+
+    act(() => result.current.openCreate());
+    act(() => result.current.setCreateForm({ permissions: [] }));
+    act(() => result.current.setDisplayUserId("VIP-1001"));
+    await act(async () => result.current.lookupTarget());
+    act(() =>
+        result.current.setCreateForm({
+            confirmPassword: "StrongPass123!",
+            password: "StrongPass123!",
+            username: "ops.zero",
+        }),
+    );
+    await act(async () => result.current.submitCreate({ preventDefault: vi.fn() }));
+
+    expect(mocks.createExternalAdminUser).toHaveBeenCalledWith("fami", {
+        password: "StrongPass123!",
+        permissions: [],
+        targetUserId: "internal-user-1001",
+        username: "ops.zero",
+    });
+});
+
+test("does not request the permission catalog without the configure-permissions grant", () => {
+    mocks.abilities = { ...mocks.abilities, canCreate: false, canManagePermissions: false };
+
+    renderHook(() => useExternalAdminUsersPage());
+
+    expect(mocks.catalogQueryOptions.enabled).toBe(false);
+    expect(mocks.listExternalAdminPermissionCatalog).not.toHaveBeenCalled();
+});
+
+test("treats an empty successful catalog as unavailable and blocks create and update writes", async () => {
+    mocks.catalogPage = { items: [], total: 0 };
+    const item = externalUserFixture();
+    const { result } = renderHook(() => useExternalAdminUsersPage());
+
+    expect(result.current.catalogError).toBe("外管权限目录为空，请联系管理员");
+    act(() => result.current.openCreate());
+    act(() => result.current.setDisplayUserId("VIP-1001"));
+    await act(async () => result.current.lookupTarget());
+    act(() =>
+        result.current.setCreateForm({
+            confirmPassword: "StrongPass123!",
+            password: "StrongPass123!",
+            username: "ops.empty",
+        }),
+    );
+    await act(async () => result.current.submitCreate({ preventDefault: vi.fn() }));
+    expect(mocks.createExternalAdminUser).not.toHaveBeenCalled();
+
+    act(() => result.current.closeCreate());
+    act(() => result.current.openPermissions(item));
+    await waitFor(() => expect(result.current.permissionLoading).toBe(false));
+    await act(async () => result.current.submitPermissions());
+
+    expect(mocks.updateExternalAdminUserPermissions).not.toHaveBeenCalled();
+    expect(mocks.showToast).toHaveBeenCalledWith("外管权限目录为空，请联系管理员", "error");
+});
+
 test("clears list filters, lookup results and password form when App scope changes", async () => {
     const { result, rerender } = renderHook(() => useExternalAdminUsersPage());
 
@@ -112,13 +207,76 @@ test("clears list filters, lookup results and password form when App scope chang
     await waitFor(() => expect(result.current.keyword).toBe(""));
     expect(result.current.status).toBe("");
     expect(result.current.createOpen).toBe(false);
-    expect(result.current.createForm).toEqual({ confirmPassword: "", displayUserId: "", password: "", username: "" });
+    expect(result.current.createForm).toEqual({ confirmPassword: "", displayUserId: "", password: "", permissions: [], username: "" });
     expect(result.current.targetUser).toBeNull();
     expect(result.current.passwordUser).toBeNull();
     expect(result.current.passwordForm).toEqual({ confirmPassword: "", password: "" });
     expect(mocks.queryOptions.queryKey[1]).toBe("lalu");
 });
 
+test("loads and replaces an account permission snapshot, including explicit zero permissions", async () => {
+    const item = externalUserFixture();
+    const { result } = renderHook(() => useExternalAdminUsersPage());
+
+    act(() => result.current.openPermissions(item));
+    await waitFor(() => expect(result.current.permissionForm.permissions).toEqual(["user:list"]));
+    expect(mocks.getExternalAdminUserPermissions).toHaveBeenCalledWith("fami", 71);
+
+    act(() => result.current.setPermissions([]));
+    await act(async () => result.current.submitPermissions());
+
+    expect(mocks.updateExternalAdminUserPermissions).toHaveBeenCalledWith("fami", 71, [], 4);
+    expect(mocks.showToast).toHaveBeenCalledWith("权限已更新，该账号需重新登录", "success");
+    expect(result.current.permissionUser).toBeNull();
+});
+
+test("keeps the permission drawer open and offers reload after a concurrent update", async () => {
+    const conflict = Object.assign(new Error("conflict"), { status: 409 });
+    mocks.updateExternalAdminUserPermissions.mockRejectedValueOnce(conflict);
+    const item = externalUserFixture();
+    const { result } = renderHook(() => useExternalAdminUsersPage());
+
+    act(() => result.current.openPermissions(item));
+    await waitFor(() => expect(result.current.permissionLoading).toBe(false));
+    await act(async () => result.current.submitPermissions());
+
+    expect(result.current.permissionUser).toEqual(item);
+    expect(result.current.permissionError).toBe("账号权限已被更新，请重新加载");
+    expect(mocks.showToast).toHaveBeenCalledWith("账号权限已被更新，请重新加载", "error");
+
+    mocks.getExternalAdminUserPermissions.mockResolvedValueOnce({
+        accountId: "71",
+        permissions: ["user:list", "user:update"],
+        revision: 5,
+    });
+    act(() => result.current.retryPermissions());
+    await waitFor(() => expect(result.current.permissionForm.expectedRevision).toBe(5));
+    await act(async () => result.current.submitPermissions());
+
+    expect(mocks.updateExternalAdminUserPermissions).toHaveBeenNthCalledWith(
+        2,
+        "fami",
+        71,
+        ["user:list", "user:update"],
+        5,
+    );
+    expect(result.current.permissionUser).toBeNull();
+});
+
+test("does not expose backend permission codes when a non-conflict update fails", async () => {
+    mocks.updateExternalAdminUserPermissions.mockRejectedValueOnce(
+        new Error("privilege:grant requires user-title:grant"),
+    );
+    const { result } = renderHook(() => useExternalAdminUsersPage());
+
+    act(() => result.current.openPermissions(externalUserFixture()));
+    await waitFor(() => expect(result.current.permissionLoading).toBe(false));
+    await act(async () => result.current.submitPermissions());
+
+    expect(result.current.permissionError).toBe("更新外管权限失败");
+    expect(mocks.showToast).toHaveBeenCalledWith("更新外管权限失败", "error");
+});
+
 test("ignores a late user lookup response after switching App", async () => {
     let resolveLookup;
     mocks.lookupExternalAdminUserTarget.mockImplementationOnce(
@@ -184,8 +342,20 @@ function externalUserFixture() {
         lastLoginAtMs: 1784077200000,
         linkedUser: targetFixture(),
         permissions: [],
+        permissionRevision: 4,
         status: "active",
         updatedAtMs: 1784077200000,
         username: "ops.fami",
     };
 }
+
+function permissionCatalogFixture() {
+    return {
+        items: [
+            { capabilities: ["user:list"], code: "user:list", defaultGranted: true, dependencies: [], group: "用户管理", label: "用户列表" },
+            { capabilities: ["user:list", "user:update"], code: "user:update", defaultGranted: true, dependencies: ["user:list"], group: "用户管理", label: "编辑用户" },
+            { capabilities: ["room:list"], code: "room:list", defaultGranted: false, dependencies: [], group: "房间管理", label: "房间列表" },
+        ],
+        total: 3,
+    };
+}
diff --git a/src/features/external-admin-users/pages/ExternalAdminUsersPage.jsx b/src/features/external-admin-users/pages/ExternalAdminUsersPage.jsx
index a6db87d..c00b450 100644
--- a/src/features/external-admin-users/pages/ExternalAdminUsersPage.jsx
+++ b/src/features/external-admin-users/pages/ExternalAdminUsersPage.jsx
@@ -1,6 +1,8 @@
 import PasswordOutlined from "@mui/icons-material/PasswordOutlined";
 import PersonAddAltOutlined from "@mui/icons-material/PersonAddAltOutlined";
 import OpenInNewOutlined from "@mui/icons-material/OpenInNewOutlined";
+import AdminPanelSettingsOutlined from "@mui/icons-material/AdminPanelSettingsOutlined";
+import { ExternalAdminPermissionDrawer } from "@/features/external-admin-users/components/ExternalAdminPermissionDrawer.jsx";
 import { ExternalAdminUserFormDialog } from "@/features/external-admin-users/components/ExternalAdminUserFormDialog.jsx";
 import { ExternalAdminUserPasswordDialog } from "@/features/external-admin-users/components/ExternalAdminUserPasswordDialog.jsx";
 import styles from "@/features/external-admin-users/external-admin-users.module.css";
@@ -56,7 +58,7 @@ const columns = [
         label: "状态",
         render: (item, _index, context) => {
             const page = context?.page;
-            // 外管状态和密码都是账号级敏感写操作；同页串行化可避免两个请求互相覆盖全局 loading 状态。
+            // 外管状态、密码和权限都是账号级敏感写操作；同页串行化可避免多个请求互相覆盖全局 loading 状态。
             const accountActionInFlight = Boolean(page?.loadingAction);
             return (
                 <AdminSwitch
@@ -74,7 +76,7 @@ const columns = [
     {
         key: "permissions",
         label: "外管权限",
-        render: (item) => (item.permissions?.length ? `${item.permissions.length} 项` : "-"),
+        render: (item) => `${item.permissions?.length || 0} 项`,
         width: "minmax(120px, 0.65fr)",
     },
     {
@@ -102,6 +104,13 @@ const columns = [
             const page = context?.page;
             return (
                 <AdminRowActions>
+                    <AdminActionIconButton
+                        disabled={!page?.abilities.canManagePermissions || Boolean(page.loadingAction)}
+                        label="配置权限"
+                        onClick={() => page.openPermissions(item)}
+                    >
+                        <AdminPanelSettingsOutlined fontSize="small" />
+                    </AdminActionIconButton>
                     <AdminActionIconButton
                         disabled={!page?.abilities.canResetPassword || Boolean(page.loadingAction)}
                         label="重置密码"
@@ -113,7 +122,7 @@ const columns = [
             );
         },
         resizable: false,
-        width: "88px",
+        width: "132px",
     },
 ];
 
@@ -192,6 +201,9 @@ export function ExternalAdminUsersPage() {
             </DataState>
             <ExternalAdminUserFormDialog
                 abilities={page.abilities}
+                catalog={page.permissionCatalog.items || []}
+                catalogError={page.catalogError}
+                catalogLoading={page.catalogLoading}
                 form={page.createForm}
                 loading={page.loadingAction === "create"}
                 lookupLoading={page.lookupLoading}
@@ -201,8 +213,25 @@ export function ExternalAdminUsersPage() {
                 onDisplayUserIdChange={page.setDisplayUserId}
                 onFormChange={page.setCreateForm}
                 onLookup={page.lookupTarget}
+                onReloadCatalog={page.reloadPermissionCatalog}
                 onSubmit={page.submitCreate}
             />
+            <ExternalAdminPermissionDrawer
+                abilities={page.abilities}
+                catalog={page.permissionCatalog.items || []}
+                catalogError={page.catalogError}
+                catalogLoading={page.catalogLoading}
+                error={page.permissionError}
+                loading={page.loadingAction.startsWith("permissions:")}
+                permissions={page.permissionForm.permissions}
+                permissionsLoading={page.permissionLoading}
+                user={page.permissionUser}
+                onChange={page.setPermissions}
+                onClose={page.closePermissions}
+                onReloadCatalog={page.reloadPermissionCatalog}
+                onRetry={page.retryPermissions}
+                onSubmit={page.submitPermissions}
+            />
             <ExternalAdminUserPasswordDialog
                 abilities={page.abilities}
                 form={page.passwordForm}
diff --git a/src/features/external-admin-users/pages/ExternalAdminUsersPage.test.jsx b/src/features/external-admin-users/pages/ExternalAdminUsersPage.test.jsx
new file mode 100644
index 0000000..b4a5717
--- /dev/null
+++ b/src/features/external-admin-users/pages/ExternalAdminUsersPage.test.jsx
@@ -0,0 +1,97 @@
+import { fireEvent, render, screen } from "@testing-library/react";
+import { beforeEach, expect, test, vi } from "vitest";
+
+const mocks = vi.hoisted(() => ({ openPermissions: vi.fn(), page: null }));
+
+vi.mock("@/features/external-admin-users/hooks/useExternalAdminUsersPage.js", () => ({
+    useExternalAdminUsersPage: () => mocks.page,
+}));
+
+import { ExternalAdminUsersPage } from "./ExternalAdminUsersPage.jsx";
+
+beforeEach(() => {
+    mocks.openPermissions.mockReset();
+    mocks.page = pageFixture();
+});
+
+test("exposes a dedicated row action for configuring external account permissions", () => {
+    render(<ExternalAdminUsersPage />);
+
+    const button = screen.getByRole("button", { name: "配置权限" });
+    fireEvent.click(button);
+
+    expect(mocks.openPermissions).toHaveBeenCalledWith(mocks.page.data.items[0]);
+    expect(screen.getByText("2 项")).toBeInTheDocument();
+});
+
+test("disables permission configuration without the main-admin grant ability", () => {
+    mocks.page.abilities.canManagePermissions = false;
+    render(<ExternalAdminUsersPage />);
+
+    expect(screen.getByRole("button", { name: "配置权限" })).toBeDisabled();
+});
+
+function pageFixture() {
+    const item = {
+        appCode: "fami",
+        createdAtMs: 1784073600000,
+        createdByAdminId: 1,
+        id: 71,
+        linkedUser: { displayUserId: "123456", userId: "user-1", username: "fami123456" },
+        permissions: ["user:list", "user:update"],
+        permissionRevision: 3,
+        status: "active",
+        username: "123456",
+    };
+    return {
+        abilities: {
+            canCreate: true,
+            canManagePermissions: true,
+            canResetPassword: true,
+            canStatus: true,
+            canView: true,
+        },
+        catalogError: "",
+        catalogLoading: false,
+        closeCreate: vi.fn(),
+        closePassword: vi.fn(),
+        closePermissions: vi.fn(),
+        createForm: { confirmPassword: "", displayUserId: "", password: "", permissions: [], username: "" },
+        createOpen: false,
+        data: { items: [item], page: 1, pageSize: 50, total: 1 },
+        error: "",
+        keyword: "",
+        loading: false,
+        loadingAction: "",
+        lookupLoading: false,
+        lookupTarget: vi.fn(),
+        openCreate: vi.fn(),
+        openPassword: vi.fn(),
+        openPermissions: mocks.openPermissions,
+        page: 1,
+        passwordForm: { confirmPassword: "", password: "" },
+        passwordUser: null,
+        permissionCatalog: { items: [], total: 0 },
+        permissionError: "",
+        permissionForm: { expectedRevision: null, permissions: [] },
+        permissionLoading: false,
+        permissionUser: null,
+        reload: vi.fn(),
+        reloadPermissionCatalog: vi.fn(),
+        resetFilters: vi.fn(),
+        retryPermissions: vi.fn(),
+        setCreateForm: vi.fn(),
+        setDisplayUserId: vi.fn(),
+        setKeyword: vi.fn(),
+        setPage: vi.fn(),
+        setPasswordForm: vi.fn(),
+        setPermissions: vi.fn(),
+        setStatus: vi.fn(),
+        status: "",
+        submitCreate: vi.fn(),
+        submitPassword: vi.fn(),
+        submitPermissions: vi.fn(),
+        targetUser: null,
+        toggleStatus: vi.fn(),
+    };
+}
diff --git a/src/features/external-admin-users/permissionSelection.js b/src/features/external-admin-users/permissionSelection.js
new file mode 100644
index 0000000..7ff42a8
--- /dev/null
+++ b/src/features/external-admin-users/permissionSelection.js
@@ -0,0 +1,58 @@
+export function defaultPermissionSelection(catalog) {
+    return catalog
+        .filter((permission) => permission.defaultGranted)
+        .reduce(
+            (selected, permission) => updatePermissionSelection(catalog, selected, permission.code, true),
+            [],
+        );
+}
+
+export function updatePermissionSelection(catalog, current, code, checked) {
+    const permissionMap = new Map(catalog.map((permission) => [permission.code, permission]));
+    const selected = new Set(current.filter((permissionCode) => permissionMap.has(permissionCode)));
+
+    if (checked) {
+        // 目录依赖由后端维护；勾选业务动作时递归补齐前置能力，保证提交的是可执行权限快照。
+        addWithDependencies(code, permissionMap, selected, new Set());
+    } else {
+        selected.delete(code);
+        // 取消前置能力后同步移除所有失去依赖的动作，避免保存一个界面无法真实使用的组合。
+        removeBrokenDependents(permissionMap, selected);
+    }
+
+    return catalog.map((permission) => permission.code).filter((permissionCode) => selected.has(permissionCode));
+}
+
+export function updatePermissionGroup(catalog, current, groupCodes, checked) {
+    return groupCodes.reduce(
+        (next, code) => updatePermissionSelection(catalog, next, code, checked),
+        current,
+    );
+}
+
+function addWithDependencies(code, permissionMap, selected, visiting) {
+    if (!permissionMap.has(code) || visiting.has(code)) {
+        return;
+    }
+    visiting.add(code);
+    const permission = permissionMap.get(code);
+    (permission.dependencies || []).forEach((dependency) =>
+        addWithDependencies(dependency, permissionMap, selected, visiting),
+    );
+    selected.add(code);
+    visiting.delete(code);
+}
+
+function removeBrokenDependents(permissionMap, selected) {
+    let changed = true;
+    while (changed) {
+        changed = false;
+        selected.forEach((code) => {
+            const dependencies = permissionMap.get(code)?.dependencies || [];
+            if (dependencies.some((dependency) => !selected.has(dependency))) {
+                selected.delete(code);
+                changed = true;
+            }
+        });
+    }
+}
diff --git a/src/features/external-admin-users/permissions.js b/src/features/external-admin-users/permissions.js
index 0d01521..3374cdb 100644
--- a/src/features/external-admin-users/permissions.js
+++ b/src/features/external-admin-users/permissions.js
@@ -3,9 +3,14 @@ import { PERMISSIONS } from "@/app/permissions";
 
 export function useExternalAdminUserAbilities() {
     const { can } = useAuth();
+    const canCreateAccount = can(PERMISSIONS.externalAdminUserCreate);
+    const canManagePermissions = can(PERMISSIONS.externalAdminUserPermissions);
 
     return {
-        canCreate: can(PERMISSIONS.externalAdminUserCreate),
+        // 创建必须同时能配置权限，禁止通过“省略权限字段使用默认值”绕过独立授权边界。
+        canCreate: canCreateAccount && canManagePermissions,
+        canCreateAccount,
+        canManagePermissions,
         canResetPassword: can(PERMISSIONS.externalAdminUserResetPassword),
         canStatus: can(PERMISSIONS.externalAdminUserStatus),
         canView: can(PERMISSIONS.externalAdminUserView),
diff --git a/src/features/external-admin-users/permissions.test.jsx b/src/features/external-admin-users/permissions.test.jsx
new file mode 100644
index 0000000..f7b2915
--- /dev/null
+++ b/src/features/external-admin-users/permissions.test.jsx
@@ -0,0 +1,28 @@
+import { renderHook } from "@testing-library/react";
+import { beforeEach, expect, test, vi } from "vitest";
+import { PERMISSIONS } from "@/app/permissions";
+
+const mocks = vi.hoisted(() => ({ granted: new Set() }));
+
+vi.mock("@/app/auth/AuthProvider.jsx", () => ({
+    useAuth: () => ({ can: (permission) => mocks.granted.has(permission) }),
+}));
+
+import { useExternalAdminUserAbilities } from "./permissions.js";
+
+beforeEach(() => {
+    mocks.granted = new Set();
+});
+
+test("requires both account creation and permission configuration grants to create", () => {
+    mocks.granted.add(PERMISSIONS.externalAdminUserCreate);
+    const { result, rerender } = renderHook(() => useExternalAdminUserAbilities());
+
+    expect(result.current.canCreateAccount).toBe(true);
+    expect(result.current.canManagePermissions).toBe(false);
+    expect(result.current.canCreate).toBe(false);
+
+    mocks.granted.add(PERMISSIONS.externalAdminUserPermissions);
+    rerender();
+    expect(result.current.canCreate).toBe(true);
+});
diff --git a/src/features/external-admin-users/schema.test.ts b/src/features/external-admin-users/schema.test.ts
index ca1e605..f54b76f 100644
--- a/src/features/external-admin-users/schema.test.ts
+++ b/src/features/external-admin-users/schema.test.ts
@@ -3,6 +3,7 @@ import {
     externalAdminUserCreateFormSchema,
     externalAdminUserLookupSchema,
     externalAdminUserPasswordFormSchema,
+    externalAdminUserPermissionsFormSchema,
 } from "./schema";
 
 describe("external admin user schemas", () => {
@@ -62,4 +63,16 @@ describe("external admin user schemas", () => {
 
         expect(result.success).toBe(false);
     });
+
+    test("preserves an explicit zero-permission snapshot and removes duplicate codes", () => {
+        expect(
+            externalAdminUserPermissionsFormSchema.parse({ expectedRevision: 4, permissions: [] }),
+        ).toEqual({ expectedRevision: 4, permissions: [] });
+        expect(
+            externalAdminUserPermissionsFormSchema.parse({
+                expectedRevision: 4,
+                permissions: ["user:list", "user:list", "room:list"],
+            }),
+        ).toEqual({ expectedRevision: 4, permissions: ["user:list", "room:list"] });
+    });
 });
diff --git a/src/features/external-admin-users/schema.ts b/src/features/external-admin-users/schema.ts
index ca85633..c39cc70 100644
--- a/src/features/external-admin-users/schema.ts
+++ b/src/features/external-admin-users/schema.ts
@@ -16,6 +16,17 @@ const usernameSchema = z
     // 外管系统使用独立登录标识；限制为跨浏览器、网关和审计日志均稳定的 ASCII 账号字符集。
     .regex(/^[A-Za-z0-9._-]+$/, "外管账号只能包含字母、数字、点、下划线和连字符");
 
+const permissionCodeSchema = z
+    .string()
+    .trim()
+    .min(1, "权限编码不能为空")
+    .max(128, "权限编码不能超过 128 个字符")
+    .refine((value) => !/[\s\p{Cc}]/u.test(value), "权限编码不能包含空白或控制字符");
+
+const permissionsSchema = z.array(permissionCodeSchema).max(200, "权限数量不能超过 200 项").transform((items) => [
+    ...new Set(items),
+]);
+
 // 密码属于登录凭证，不能 trim 或自动改写；前端只做长度与确认值校验，服务端会重复校验并仅持久化密码摘要。
 const passwordSchema = z
     .string()
@@ -32,6 +43,7 @@ export const externalAdminUserCreateFormSchema = z
         confirmPassword: passwordSchema,
         displayUserId: displayUserIdSchema,
         password: passwordSchema,
+        permissions: permissionsSchema.optional(),
         username: usernameSchema,
     })
     .superRefine((value, context) => {
@@ -57,7 +69,15 @@ export const externalAdminUserStatusSchema = z.object({
     status: z.enum(["active", "disabled"]),
 });
 
+export const externalAdminUserPermissionsFormSchema = z.object({
+    expectedRevision: z.number().int().positive("权限版本不正确"),
+    // 空数组是明确的零权限快照，不能用默认权限替换，也不能在提交前过滤掉该字段。
+    permissions: permissionsSchema,
+});
+
 export type ExternalAdminUserCreateForm = z.input<typeof externalAdminUserCreateFormSchema>;
 export type ExternalAdminUserCreatePayload = z.output<typeof externalAdminUserCreateFormSchema>;
 export type ExternalAdminUserPasswordForm = z.input<typeof externalAdminUserPasswordFormSchema>;
 export type ExternalAdminUserPasswordPayload = z.output<typeof externalAdminUserPasswordFormSchema>;
+export type ExternalAdminUserPermissionsForm = z.input<typeof externalAdminUserPermissionsFormSchema>;
+export type ExternalAdminUserPermissionsPayload = z.output<typeof externalAdminUserPermissionsFormSchema>;
diff --git a/src/shared/api/generated/endpoints.ts b/src/shared/api/generated/endpoints.ts
index 4ca64a5..7125e62 100644
--- a/src/shared/api/generated/endpoints.ts
+++ b/src/shared/api/generated/endpoints.ts
@@ -136,6 +136,7 @@ export const API_OPERATIONS = {
   getCPConfig: "getCPConfig",
   getCPWeeklyRankConfig: "getCPWeeklyRankConfig",
   getCumulativeRechargeRewardConfig: "getCumulativeRechargeRewardConfig",
+  getExternalAdminUserPermissions: "getExternalAdminUserPermissions",
   getFinanceCoinSellerRechargeExchangeRate: "getFinanceCoinSellerRechargeExchangeRate",
   getFinanceScope: "getFinanceScope",
   getFinanceUSDTAddresses: "getFinanceUSDTAddresses",
@@ -211,6 +212,7 @@ export const API_OPERATIONS = {
   listEmojiPackCategories: "listEmojiPackCategories",
   listEmojiPacks: "listEmojiPacks",
   listExploreTabs: "listExploreTabs",
+  listExternalAdminPermissionCatalog: "listExternalAdminPermissionCatalog",
   listExternalAdminUsers: "listExternalAdminUsers",
   listFinanceCoinSellerRechargeOrders: "listFinanceCoinSellerRechargeOrders",
   listFinanceScopeAssignments: "listFinanceScopeAssignments",
@@ -346,6 +348,7 @@ export const API_OPERATIONS = {
   updateCumulativeRechargeRewardConfig: "updateCumulativeRechargeRewardConfig",
   updateDiceConfig: "updateDiceConfig",
   updateExploreTab: "updateExploreTab",
+  updateExternalAdminUserPermissions: "updateExternalAdminUserPermissions",
   updateExternalAdminUserStatus: "updateExternalAdminUserStatus",
   updateFirstRechargeRewardConfig: "updateFirstRechargeRewardConfig",
   updateGift: "updateGift",
@@ -684,7 +687,7 @@ export const API_ENDPOINTS: Record<ApiOperationId, ApiEndpoint> = {
     operationId: API_OPERATIONS.createExternalAdminUser,
     path: "/v1/admin/external-admin-users",
     permission: "external-admin-user:create",
-    permissions: ["external-admin-user:create"]
+    permissions: ["external-admin-user:create","external-admin-user:permissions"]
   },
   createFinanceCoinSellerRechargeOrder: {
     method: "POST",
@@ -1267,6 +1270,13 @@ export const API_ENDPOINTS: Record<ApiOperationId, ApiEndpoint> = {
     permission: "cumulative-recharge-reward:view",
     permissions: ["cumulative-recharge-reward:view"]
   },
+  getExternalAdminUserPermissions: {
+    method: "GET",
+    operationId: API_OPERATIONS.getExternalAdminUserPermissions,
+    path: "/v1/admin/external-admin-users/{id}/permissions",
+    permission: "external-admin-user:permissions",
+    permissions: ["external-admin-user:permissions"]
+  },
   getFinanceCoinSellerRechargeExchangeRate: {
     method: "GET",
     operationId: API_OPERATIONS.getFinanceCoinSellerRechargeExchangeRate,
@@ -1790,6 +1800,13 @@ export const API_ENDPOINTS: Record<ApiOperationId, ApiEndpoint> = {
     permission: "app-config:view",
     permissions: ["app-config:view"]
   },
+  listExternalAdminPermissionCatalog: {
+    method: "GET",
+    operationId: API_OPERATIONS.listExternalAdminPermissionCatalog,
+    path: "/v1/admin/external-admin-users/permission-catalog",
+    permission: "external-admin-user:permissions",
+    permissions: ["external-admin-user:permissions"]
+  },
   listExternalAdminUsers: {
     method: "GET",
     operationId: API_OPERATIONS.listExternalAdminUsers,
@@ -2721,6 +2738,13 @@ export const API_ENDPOINTS: Record<ApiOperationId, ApiEndpoint> = {
     permission: "app-config:update",
     permissions: ["app-config:update"]
   },
+  updateExternalAdminUserPermissions: {
+    method: "PUT",
+    operationId: API_OPERATIONS.updateExternalAdminUserPermissions,
+    path: "/v1/admin/external-admin-users/{id}/permissions",
+    permission: "external-admin-user:permissions",
+    permissions: ["external-admin-user:permissions"]
+  },
   updateExternalAdminUserStatus: {
     method: "PATCH",
     operationId: API_OPERATIONS.updateExternalAdminUserStatus,
diff --git a/src/shared/api/generated/schema.d.ts b/src/shared/api/generated/schema.d.ts
index e3698b9..401af3d 100644
--- a/src/shared/api/generated/schema.d.ts
+++ b/src/shared/api/generated/schema.d.ts
@@ -3612,6 +3612,22 @@ export interface paths {
         patch?: never;
         trace?: never;
     };
+    "/admin/external-admin-users/permission-catalog": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get: operations["listExternalAdminPermissionCatalog"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
     "/admin/external-admin-users/target": {
         parameters: {
             query?: never;
@@ -3660,6 +3676,22 @@ export interface paths {
         patch?: never;
         trace?: never;
     };
+    "/admin/external-admin-users/{id}/permissions": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get: operations["getExternalAdminUserPermissions"];
+        put: operations["updateExternalAdminUserPermissions"];
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
     "/exports/app-users": {
         parameters: {
             query?: never;
@@ -4796,6 +4828,12 @@ export interface components {
         ApiResponseExternalAdminUserTarget: components["schemas"]["Envelope"] & {
             data?: components["schemas"]["ExternalAdminUserTargetLookup"];
         };
+        ApiResponseExternalAdminPermissionCatalog: components["schemas"]["Envelope"] & {
+            data?: components["schemas"]["ExternalAdminPermissionCatalog"];
+        };
+        ApiResponseExternalAdminUserPermissions: components["schemas"]["Envelope"] & {
+            data?: components["schemas"]["ExternalAdminUserPermissions"];
+        };
         ApiPageExternalAdminUser: {
             items: components["schemas"]["ExternalAdminUser"][];
             page: number;
@@ -4825,6 +4863,8 @@ export interface components {
             status: "active" | "disabled";
             linkedUser: components["schemas"]["ExternalAdminUserTarget"];
             permissions: string[];
+            /** Format: int64 */
+            permissionRevision: number;
             createdByAdminId?: number;
             /** Format: int64 */
             lastLoginAtMs?: number | null;
@@ -4837,6 +4877,30 @@ export interface components {
             targetUserId: string;
             username: string;
             password: string;
+            permissions?: string[];
+        };
+        ExternalAdminPermissionCatalogItem: {
+            code: string;
+            label: string;
+            group: string;
+            dependencies: string[];
+            capabilities: string[];
+            defaultGranted: boolean;
+        };
+        ExternalAdminPermissionCatalog: {
+            items: components["schemas"]["ExternalAdminPermissionCatalogItem"][];
+            total: number;
+        };
+        ExternalAdminUserPermissions: {
+            accountId: string;
+            permissions: string[];
+            /** Format: int64 */
+            revision: number;
+        };
+        ExternalAdminUserPermissionsInput: {
+            permissions: string[];
+            /** Format: int64 */
+            expectedRevision: number;
         };
         ExternalAdminUserStatusInput: {
             /** @enum {string} */
@@ -7030,6 +7094,24 @@ export interface components {
                 "application/json": components["schemas"]["ApiResponseExternalAdminUserTarget"];
             };
         };
+        /** @description External admin permission catalog */
+        ExternalAdminPermissionCatalogResponse: {
+            headers: {
+                [name: string]: unknown;
+            };
+            content: {
+                "application/json": components["schemas"]["ApiResponseExternalAdminPermissionCatalog"];
+            };
+        };
+        /** @description External admin account permissions */
+        ExternalAdminUserPermissionsResponse: {
+            headers: {
+                [name: string]: unknown;
+            };
+            content: {
+                "application/json": components["schemas"]["ApiResponseExternalAdminUserPermissions"];
+            };
+        };
         /** @description OK */
         AgencyPageResponse: {
             headers: {
@@ -12214,6 +12296,20 @@ export interface operations {
             201: components["responses"]["ExternalAdminUserResponse"];
         };
     };
+    listExternalAdminPermissionCatalog: {
+        parameters: {
+            query?: never;
+            header: {
+                "X-App-Code": components["parameters"]["AppCodeHeader"];
+            };
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            200: components["responses"]["ExternalAdminPermissionCatalogResponse"];
+        };
+    };
     lookupExternalAdminUserTarget: {
         parameters: {
             query: {
@@ -12270,6 +12366,42 @@ export interface operations {
             200: components["responses"]["ExternalAdminUserResponse"];
         };
     };
+    getExternalAdminUserPermissions: {
+        parameters: {
+            query?: never;
+            header: {
+                "X-App-Code": components["parameters"]["AppCodeHeader"];
+            };
+            path: {
+                id: components["parameters"]["Id"];
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            200: components["responses"]["ExternalAdminUserPermissionsResponse"];
+        };
+    };
+    updateExternalAdminUserPermissions: {
+        parameters: {
+            query?: never;
+            header: {
+                "X-App-Code": components["parameters"]["AppCodeHeader"];
+            };
+            path: {
+                id: components["parameters"]["Id"];
+            };
+            cookie?: never;
+        };
+        requestBody: {
+            content: {
+                "application/json": components["schemas"]["ExternalAdminUserPermissionsInput"];
+            };
+        };
+        responses: {
+            200: components["responses"]["ExternalAdminUserResponse"];
+        };
+    };
     appExportUsers: {
         parameters: {
             query?: {
diff --git a/src/shared/api/request.test.ts b/src/shared/api/request.test.ts
index 96c7337..7a18c87 100644
--- a/src/shared/api/request.test.ts
+++ b/src/shared/api/request.test.ts
@@ -84,3 +84,17 @@ test("does not replay mutations after a network failure", async () => {
   await expect(apiRequest("/v1/admin/countries", { body: {}, method: "POST" })).rejects.toThrow("Failed to fetch");
   expect(fetch).toHaveBeenCalledTimes(1);
 });
+
+test("preserves the HTTP status on API errors for optimistic concurrency handling", async () => {
+  vi.stubGlobal(
+    "fetch",
+    vi.fn().mockResolvedValueOnce(
+      new Response(JSON.stringify({ code: 409, message: "账号权限版本冲突" }), { status: 409 })
+    )
+  );
+
+  await expect(apiRequest("/v1/admin/external-admin-users/71/permissions", { body: {}, method: "PUT" })).rejects.toMatchObject({
+    message: "账号权限版本冲突",
+    status: 409
+  });
+});
diff --git a/src/shared/api/request.ts b/src/shared/api/request.ts
index eefe9b5..0144db7 100644
--- a/src/shared/api/request.ts
+++ b/src/shared/api/request.ts
@@ -124,19 +124,26 @@ export async function apiRequest<TData = unknown, TBody = unknown>(
 
   if (raw) {
     if (!response.ok) {
-      throw new Error(response.statusText || "请求失败");
+      throw requestError(response.statusText || "请求失败", response.status);
     }
     return response;
   }
 
   const payload = await readJSON(response);
   if (!response.ok || payload.code !== 0) {
-    throw new Error(resolveErrorMessage(response, payload.message));
+    throw requestError(resolveErrorMessage(response, payload.message), response.status);
   }
 
   return payload.data as TData;
 }
 
+function requestError(message: string, status: number) {
+  const error = new Error(message) as Error & { status: number };
+  // 保留 HTTP 状态供并发写入等业务分支精确判断，同时维持既有 Error message 行为。
+  error.status = status;
+  return error;
+}
+
 function refreshOnce() {
   if (!refreshHandler) {
     return Promise.resolve(false);