diff --git a/apps/web/src/pages/generate/GeneratePage.tsx b/apps/web/src/pages/generate/GeneratePage.tsx
index 29ed669a9..fa48251da 100644
--- a/apps/web/src/pages/generate/GeneratePage.tsx
+++ b/apps/web/src/pages/generate/GeneratePage.tsx
@@ -107,7 +107,7 @@ const GeneratePage: React.FC = () => {
   useEffect(() => {
     setPreviewTaskId(null)
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [previewAssetIds, selectedTemplate, duration, videoRatio, titleKey, setPreviewTaskId])
+  }, [previewAssetIds, selectedTemplate, duration, videoRatio, titleKey, bgm, setPreviewTaskId])
 
   const previewAssetsEnabled = currentStep >= 4 && previewAssetIds.length > 0
   const {
diff --git a/apps/web/src/pages/generate/hooks/useGenerateVideo.ts b/apps/web/src/pages/generate/hooks/useGenerateVideo.ts
index 569c05793..e8f1d14dc 100755
--- a/apps/web/src/pages/generate/hooks/useGenerateVideo.ts
+++ b/apps/web/src/pages/generate/hooks/useGenerateVideo.ts
@@ -96,8 +96,10 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
       // ── Step7 确认生成：优先复用预览产物（秒出），fallback 到全量渲染 ──
       let taskId: string | undefined
 
-      // 主路径：如果有预览任务 ID，调用 confirmGeneration 复用预览产物
-      if (props.previewTaskId) {
+      // 主路径：如果有预览任务 ID 且只生成 1 个视频，调用 confirmGeneration 复用预览产物
+      // generateCount > 1 时需要走 createGenerationTask 支持批量生成
+      const isSingleGenerate = !props.generateCount || props.generateCount === 1
+      if (props.previewTaskId && isSingleGenerate) {
         try {
           console.log(
             "[handleGenerate] 尝试 confirmGeneration 复用预览产物, previewTaskId:",