diff --git a/internal/service/hotgame/app_provider.go b/internal/service/hotgame/app_provider.go
index 2bcac78..b336a69 100644
--- a/internal/service/hotgame/app_provider.go
+++ b/internal/service/hotgame/app_provider.go
@@ -228,7 +228,8 @@ func (r gameRow) name() string {
 }
 
 func (r gameRow) cover() string {
-	return defaultIfBlank(r.Cover, defaultIfBlank(r.CatalogCover, r.previewURL()))
+	// 热游的 preview_url 是带用户占位符的 H5 启动地址，不是图片资源；封面为空时直接返回空值，避免客户端把启动页当图片加载。
+	return defaultIfBlank(r.Cover, r.CatalogCover)
 }
 
 func (r gameRow) previewURL() string {
diff --git a/internal/service/hotgame/catalog.go b/internal/service/hotgame/catalog.go
index d1ec152..fc59aca 100644
--- a/internal/service/hotgame/catalog.go
+++ b/internal/service/hotgame/catalog.go
@@ -307,14 +307,15 @@ func (s *Service) importCatalogGamesTx(tx *gorm.DB, sysOrigin, profile string, f
 			return nil, idErr
 		}
 		cfg := model.SysGameListConfig{
-			ID:           nextCfgID,
-			SysOrigin:    sysOrigin,
-			GameOrigin:   vendorType,
-			GameID:       defaultIfBlank(catalog.InternalGameID, vendorGameID),
-			Name:         catalog.Name,
-			Category:     roomCategory,
-			GameCode:     vendorGameID,
-			Cover:        defaultIfBlank(catalog.Cover, catalog.PreviewURL),
+			ID:         nextCfgID,
+			SysOrigin:  sysOrigin,
+			GameOrigin: vendorType,
+			GameID:     defaultIfBlank(catalog.InternalGameID, vendorGameID),
+			Name:       catalog.Name,
+			Category:   roomCategory,
+			GameCode:   vendorGameID,
+			// 热游启动地址包含 uid/token/lang 占位符且整体很长，不能在缺少封面时回填到 cover；封面为空时交给客户端展示默认占位，真正启动地址只放在扩展表里。
+			Cover:        hotgameCatalogCover(catalog),
 			Showcase:     defaultShowcase,
 			Sort:         parseSort(vendorGameID),
 			FullScreen:   fullScreen,
@@ -359,8 +360,9 @@ func (s *Service) refreshExistingGame(tx *gorm.DB, configID int64, catalog model
 	if err := tx.Model(&model.SysGameListConfig{}).
 		Where("id = ? AND game_origin = ?", configID, vendorType).
 		Updates(map[string]any{
-			"name":        catalog.Name,
-			"cover":       defaultIfBlank(catalog.Cover, catalog.PreviewURL),
+			"name": catalog.Name,
+			// 这里和新导入保持一致，只刷新真实封面，避免把 H5 启动链接写入封面列导致 MySQL 长度错误。
+			"cover":       hotgameCatalogCover(catalog),
 			"full_screen": fullScreen,
 		}).Error; err != nil {
 		return err
@@ -383,6 +385,10 @@ func hotgameLaunchURLForProfile(game defaultCatalogGame, profile string) string
 	return strings.TrimSpace(game.ProdURL)
 }
 
+func hotgameCatalogCover(catalog model.HotgameGameCatalog) string {
+	return strings.TrimSpace(catalog.Cover)
+}
+
 func resolveImportDefaultShowcase(values ...bool) bool {
 	if len(values) == 0 {
 		return true
diff --git a/internal/service/hotgame/catalog_test.go b/internal/service/hotgame/catalog_test.go
index a2d20a6..2316b6c 100644
--- a/internal/service/hotgame/catalog_test.go
+++ b/internal/service/hotgame/catalog_test.go
@@ -38,6 +38,22 @@ func TestSyncImportAndListRoomGames(t *testing.T) {
 		t.Fatalf("ImportCatalogGames() imported = %d, want 1", importResp.Imported)
 	}
 
+	var cfg model.SysGameListConfig
+	if err := db.Where("game_origin = ? AND game_id = ?", vendorType, "hg_1").First(&cfg).Error; err != nil {
+		t.Fatalf("load imported game config: %v", err)
+	}
+	if cfg.Cover != "" {
+		t.Fatalf("imported cover = %q, want blank because launch url must stay out of cover", cfg.Cover)
+	}
+
+	var ext model.SysGameListVendorExt
+	if err := db.Where("game_list_config_id = ? AND vendor_type = ?", cfg.ID, vendorType).First(&ext).Error; err != nil {
+		t.Fatalf("load imported vendor ext: %v", err)
+	}
+	if !strings.Contains(ext.PreviewURL, "uid={uid}") || !strings.Contains(ext.PackageURL, "token={token}") {
+		t.Fatalf("vendor ext lost launch url placeholders: preview=%q package=%q", ext.PreviewURL, ext.PackageURL)
+	}
+
 	provider := NewAppProvider(service)
 	list, err := provider.ListRoomGames(context.Background(), gameprovider.AuthUser{UserID: 1234567, SysOrigin: "LIKEI"}, "room-1", "")
 	if err != nil {
@@ -50,6 +66,9 @@ func TestSyncImportAndListRoomGames(t *testing.T) {
 	if item.Provider != vendorType || item.ProviderGameID != "1" || item.GameID != "hg_1" {
 		t.Fatalf("ListRoomGames() item = %+v", item)
 	}
+	if item.Cover != "" {
+		t.Fatalf("ListRoomGames() cover = %q, want blank because hotgame preview url is not an image", item.Cover)
+	}
 	if item.LaunchParams["screenMode"] != "seven" {
 		t.Fatalf("ListRoomGames() screenMode = %v, want seven", item.LaunchParams["screenMode"])
 	}
diff --git a/migrations/053_sys_game_list_cover_length.sql b/migrations/053_sys_game_list_cover_length.sql
new file mode 100644
index 0000000..b7a980e
--- /dev/null
+++ b/migrations/053_sys_game_list_cover_length.sql
@@ -0,0 +1,17 @@
+SET @current_schema := DATABASE();
+
+SET @modify_sys_game_list_cover_sql := IF(
+  EXISTS (
+    SELECT 1
+    FROM information_schema.columns
+    WHERE table_schema = @current_schema
+      AND table_name = 'sys_game_list_config'
+      AND column_name = 'cover'
+  ),
+  'ALTER TABLE `sys_game_list_config` MODIFY COLUMN `cover` VARCHAR(1024) DEFAULT NULL COMMENT ''封面图''',
+  'SELECT 1'
+);
+
+PREPARE modify_sys_game_list_cover_stmt FROM @modify_sys_game_list_cover_sql;
+EXECUTE modify_sys_game_list_cover_stmt;
+DEALLOCATE PREPARE modify_sys_game_list_cover_stmt;