diff --git a/contracts/admin-openapi.json b/contracts/admin-openapi.json
index f497db6..16e2113 100644
--- a/contracts/admin-openapi.json
+++ b/contracts/admin-openapi.json
@@ -2764,6 +2764,24 @@
         "/admin/payment/third-party-rates/sync": {
             "post": {
                 "operationId": "syncThirdPartyPaymentRates",
+                "requestBody": {
+                    "required": true,
+                    "content": {
+                        "application/json": {
+                            "schema": {
+                                "type": "object",
+                                "required": ["markupPercent"],
+                                "properties": {
+                                    "markupPercent": {
+                                        "type": "number",
+                                        "minimum": 0,
+                                        "maximum": 100
+                                    }
+                                }
+                            }
+                        }
+                    }
+                },
                 "responses": {
                     "200": {
                         "$ref": "#/components/responses/EmptyResponse"
diff --git a/src/features/payment/api.ts b/src/features/payment/api.ts
index f159750..d51ef44 100644
--- a/src/features/payment/api.ts
+++ b/src/features/payment/api.ts
@@ -11,6 +11,7 @@ import type {
     TemporaryPaymentLinkDto,
     ThirdPartyPaymentChannelDto,
     ThirdPartyPaymentMethodDto,
+    ThirdPartyPaymentRateSyncPayload,
     ThirdPartyPaymentRateSyncDto,
 } from "@/shared/api/types";
 
@@ -121,9 +122,15 @@ export function updateThirdPartyPaymentRate(
     );
 }
 
-export function syncThirdPartyPaymentRates(): Promise<ThirdPartyPaymentRateSyncDto> {
+export function syncThirdPartyPaymentRates(
+    payload: ThirdPartyPaymentRateSyncPayload = { markupPercent: 0 },
+): Promise<ThirdPartyPaymentRateSyncDto> {
     const endpoint = API_ENDPOINTS.syncThirdPartyPaymentRates;
-    return apiRequest<ThirdPartyPaymentRateSyncDto>(apiEndpointPath(API_OPERATIONS.syncThirdPartyPaymentRates), {
-        method: endpoint.method,
-    });
+    return apiRequest<ThirdPartyPaymentRateSyncDto, ThirdPartyPaymentRateSyncPayload>(
+        apiEndpointPath(API_OPERATIONS.syncThirdPartyPaymentRates),
+        {
+            body: payload,
+            method: endpoint.method,
+        },
+    );
 }
diff --git a/src/features/payment/hooks/useThirdPartyPaymentPage.js b/src/features/payment/hooks/useThirdPartyPaymentPage.js
index fe07b2c..1d97e65 100644
--- a/src/features/payment/hooks/useThirdPartyPaymentPage.js
+++ b/src/features/payment/hooks/useThirdPartyPaymentPage.js
@@ -6,10 +6,12 @@ import {
     updateThirdPartyPaymentRate,
 } from "@/features/payment/api";
 import { usePaymentAbilities } from "@/features/payment/permissions.js";
+import { thirdPartyPaymentRateSyncSchema } from "@/features/payment/schema";
 import { useAdminQuery } from "@/shared/hooks/useAdminQuery.js";
 import { useToast } from "@/shared/ui/ToastProvider.jsx";
 
 const emptyChannels = { items: [], total: 0 };
+const defaultSyncRateForm = { markupPercent: "0" };
 
 export function useThirdPartyPaymentPage() {
     const abilities = usePaymentAbilities();
@@ -17,6 +19,8 @@ export function useThirdPartyPaymentPage() {
     const [expandedChannel, setExpandedChannel] = useState("");
     const [loadingAction, setLoadingAction] = useState("");
     const [rateDrafts, setRateDrafts] = useState({});
+    const [syncRateDialogOpen, setSyncRateDialogOpen] = useState(false);
+    const [syncRateForm, setSyncRateFormState] = useState(defaultSyncRateForm);
 
     // 三方支付页是配置中心入口，列表必须包含已关闭方式，H5 只展示后端判定可用的方式。
     // 这里不在前端过滤关闭项，保证运营可以重新打开某个国家或某个支付方式。
@@ -66,6 +70,26 @@ export function useThirdPartyPaymentPage() {
         setRateDrafts((current) => ({ ...current, [String(methodId)]: value }));
     };
 
+    const setSyncRateMarkupPercent = (value) => {
+        setSyncRateFormState({ markupPercent: value });
+    };
+
+    const openSyncRateDialog = () => {
+        if (!abilities.canUpdateThirdParty) {
+            return;
+        }
+        setSyncRateFormState(defaultSyncRateForm);
+        setSyncRateDialogOpen(true);
+    };
+
+    const closeSyncRateDialog = () => {
+        // 同步请求已经开始后不允许关闭弹窗，避免运营误判请求被取消；接口返回后统一由成功/失败提示收敛状态。
+        if (loadingAction === "sync-rates") {
+            return;
+        }
+        setSyncRateDialogOpen(false);
+    };
+
     const toggleMethod = async (method, active) => {
         // 权限判断放在动作入口，避免只依赖按钮禁用；接口失败时保留原状态并提示。
         if (!abilities.canUpdateThirdParty) {
@@ -107,16 +131,23 @@ export function useThirdPartyPaymentPage() {
         }
     };
 
-    const syncRates = async () => {
-        // 汇率同步只触发服务端动作；汇率源、失败切换和写库都在 admin-server 完成，前端不接收可篡改的汇率输入。
+    const submitSyncRates = async (event) => {
+        event?.preventDefault();
+        // 上浮比例只表达运营策略，不在前端计算最终汇率；服务端会拉实时源、套用比例并按 1 位小数向上取整，避免旧页面数据参与写库。
         if (!abilities.canUpdateThirdParty) {
             return;
         }
+        const parsed = thirdPartyPaymentRateSyncSchema.safeParse(syncRateForm);
+        if (!parsed.success) {
+            showToast(parsed.error.issues[0]?.message || "汇率同步参数不正确", "error");
+            return;
+        }
         setLoadingAction("sync-rates");
         try {
-            const summary = await syncThirdPartyPaymentRates();
+            const summary = await syncThirdPartyPaymentRates({ markupPercent: parsed.data.markupPercent });
             const fresh = await result.reload();
             setRateDrafts(rateDraftsFromChannels(fresh?.items || []));
+            setSyncRateDialogOpen(false);
             const suffix = summary?.sourceNames?.length ? `（${summary.sourceNames.join("、")}）` : "";
             showToast(`汇率已同步 ${summary?.updatedCount || 0} 个支付方式${suffix}`, "success");
         } catch (err) {
@@ -130,15 +161,20 @@ export function useThirdPartyPaymentPage() {
         abilities,
         activeChannel,
         channels,
+        closeSyncRateDialog,
         error: result.error,
         expandedChannel,
         loading: result.loading,
         loadingAction,
+        openSyncRateDialog,
         rateDrafts,
         reload: result.reload,
         saveRate,
         setRateDraft,
-        syncRates,
+        setSyncRateMarkupPercent,
+        submitSyncRates,
+        syncRateDialogOpen,
+        syncRateForm,
         toggleChannel,
         toggleMethod,
     };
diff --git a/src/features/payment/pages/ThirdPartyPaymentPage.jsx b/src/features/payment/pages/ThirdPartyPaymentPage.jsx
index f3e0b46..f486221 100644
--- a/src/features/payment/pages/ThirdPartyPaymentPage.jsx
+++ b/src/features/payment/pages/ThirdPartyPaymentPage.jsx
@@ -2,10 +2,12 @@ import KeyboardArrowDownOutlined from "@mui/icons-material/KeyboardArrowDownOutl
 import KeyboardArrowRightOutlined from "@mui/icons-material/KeyboardArrowRightOutlined";
 import SettingsOutlined from "@mui/icons-material/SettingsOutlined";
 import SyncOutlined from "@mui/icons-material/SyncOutlined";
+import InputAdornment from "@mui/material/InputAdornment";
 import TextField from "@mui/material/TextField";
 import { useMemo } from "react";
 import { useNavigate } from "react-router-dom";
 import { useThirdPartyPaymentPage } from "@/features/payment/hooks/useThirdPartyPaymentPage.js";
+import { AdminFormDialog } from "@/shared/ui/AdminFormDialog.jsx";
 import { AdminListBody, AdminListPage, AdminListToolbar } from "@/shared/ui/AdminListLayout.jsx";
 import { AdminSwitch } from "@/shared/ui/AdminSwitch.jsx";
 import { Button } from "@/shared/ui/Button.jsx";
@@ -30,7 +32,7 @@ export function ThirdPartyPaymentContent({ embedded = false, showProductButton =
                         <Button
                             disabled={!page.abilities.canUpdateThirdParty || page.loadingAction === "sync-rates"}
                             startIcon={<SyncOutlined fontSize="small" />}
-                            onClick={page.syncRates}
+                            onClick={page.openSyncRateDialog}
                         >
                             支付汇率全球同步
                         </Button>
@@ -159,6 +161,31 @@ export function ThirdPartyPaymentContent({ embedded = false, showProductButton =
                     </div>
                 </AdminListBody>
             </DataState>
+            <AdminFormDialog
+                loading={page.loadingAction === "sync-rates"}
+                open={page.syncRateDialogOpen}
+                size="narrow"
+                submitLabel="确定"
+                title="同步支付汇率"
+                onClose={page.closeSyncRateDialog}
+                onSubmit={page.submitSyncRates}
+            >
+                <TextField
+                    autoFocus
+                    disabled={page.loadingAction === "sync-rates" || !page.abilities.canUpdateThirdParty}
+                    fullWidth
+                    label="汇率上浮比例"
+                    required
+                    slotProps={{
+                        htmlInput: { inputMode: "decimal", max: 100, min: 0, step: "0.1" },
+                        input: {
+                            endAdornment: <InputAdornment position="end">%</InputAdornment>,
+                        },
+                    }}
+                    value={page.syncRateForm.markupPercent}
+                    onChange={(event) => page.setSyncRateMarkupPercent(event.target.value)}
+                />
+            </AdminFormDialog>
         </>
     );
 
diff --git a/src/features/payment/pages/ThirdPartyPaymentPage.test.jsx b/src/features/payment/pages/ThirdPartyPaymentPage.test.jsx
new file mode 100644
index 0000000..d35eb16
--- /dev/null
+++ b/src/features/payment/pages/ThirdPartyPaymentPage.test.jsx
@@ -0,0 +1,76 @@
+import { fireEvent, render, screen } from "@testing-library/react";
+import { MemoryRouter } from "react-router-dom";
+import { afterEach, expect, test, vi } from "vitest";
+import { ThirdPartyPaymentPage } from "@/features/payment/pages/ThirdPartyPaymentPage.jsx";
+import { useThirdPartyPaymentPage } from "@/features/payment/hooks/useThirdPartyPaymentPage.js";
+
+vi.mock("@/features/payment/hooks/useThirdPartyPaymentPage.js", () => ({
+    useThirdPartyPaymentPage: vi.fn(),
+}));
+
+afterEach(() => {
+    vi.clearAllMocks();
+});
+
+test("third-party payment sync button opens rate markup dialog", () => {
+    const page = pageFixture({ openSyncRateDialog: vi.fn() });
+    vi.mocked(useThirdPartyPaymentPage).mockReturnValue(page);
+
+    renderPage();
+
+    fireEvent.click(screen.getByRole("button", { name: "支付汇率全球同步" }));
+
+    expect(page.openSyncRateDialog).toHaveBeenCalledTimes(1);
+});
+
+test("third-party payment rate dialog submits markup percent", () => {
+    const page = pageFixture({
+        setSyncRateMarkupPercent: vi.fn(),
+        submitSyncRates: vi.fn((event) => event.preventDefault()),
+        syncRateDialogOpen: true,
+    });
+    vi.mocked(useThirdPartyPaymentPage).mockReturnValue(page);
+
+    renderPage();
+
+    fireEvent.change(screen.getByRole("textbox", { name: /汇率上浮比例/ }), { target: { value: "3" } });
+    fireEvent.click(screen.getByRole("button", { name: "确定" }));
+
+    expect(page.setSyncRateMarkupPercent).toHaveBeenCalledWith("3");
+    expect(page.submitSyncRates).toHaveBeenCalledTimes(1);
+});
+
+function renderPage() {
+    return render(
+        <MemoryRouter>
+            <ThirdPartyPaymentPage />
+        </MemoryRouter>,
+    );
+}
+
+function pageFixture(overrides = {}) {
+    return {
+        abilities: {
+            canUpdateThirdParty: true,
+        },
+        activeChannel: null,
+        channels: [],
+        closeSyncRateDialog: vi.fn(),
+        error: null,
+        expandedChannel: "",
+        loading: false,
+        loadingAction: "",
+        openSyncRateDialog: vi.fn(),
+        rateDrafts: {},
+        reload: vi.fn(),
+        saveRate: vi.fn(),
+        setRateDraft: vi.fn(),
+        setSyncRateMarkupPercent: vi.fn(),
+        submitSyncRates: vi.fn((event) => event.preventDefault()),
+        syncRateDialogOpen: false,
+        syncRateForm: { markupPercent: "0" },
+        toggleChannel: vi.fn(),
+        toggleMethod: vi.fn(),
+        ...overrides,
+    };
+}
diff --git a/src/features/payment/schema.ts b/src/features/payment/schema.ts
index 758c57f..8b5f390 100644
--- a/src/features/payment/schema.ts
+++ b/src/features/payment/schema.ts
@@ -18,3 +18,15 @@ export const rechargeProductSchema = z.object({
 });
 
 export type RechargeProductForm = z.infer<typeof rechargeProductSchema>;
+
+export const thirdPartyPaymentRateSyncSchema = z.object({
+    markupPercent: z
+        .string()
+        .trim()
+        .min(1, "请填写汇率上浮比例")
+        .regex(/^(?:\d+|\d+\.\d{1,4})$/, "汇率上浮比例最多支持 4 位小数")
+        .transform(Number)
+        .pipe(z.number().min(0, "汇率上浮比例不能小于 0").max(100, "汇率上浮比例不能大于 100")),
+});
+
+export type ThirdPartyPaymentRateSyncForm = z.infer<typeof thirdPartyPaymentRateSyncSchema>;
diff --git a/src/shared/api/generated/schema.d.ts b/src/shared/api/generated/schema.d.ts
index bd06faa..73ca482 100644
--- a/src/shared/api/generated/schema.d.ts
+++ b/src/shared/api/generated/schema.d.ts
@@ -6114,7 +6114,13 @@ export interface operations {
             path?: never;
             cookie?: never;
         };
-        requestBody?: never;
+        requestBody: {
+            content: {
+                "application/json": {
+                    markupPercent: number;
+                };
+            };
+        };
         responses: {
             200: components["responses"]["EmptyResponse"];
         };
diff --git a/src/shared/api/types.ts b/src/shared/api/types.ts
index d66e08f..ff280b6 100644
--- a/src/shared/api/types.ts
+++ b/src/shared/api/types.ts
@@ -473,6 +473,10 @@ export interface ThirdPartyPaymentChannelDto {
     status?: string;
 }
 
+export interface ThirdPartyPaymentRateSyncPayload {
+    markupPercent: number;
+}
+
 export interface TemporaryPaymentLinkDto {
     appCode?: string;
     audienceType?: string;