diff --git a/apps/web/src/pages/generate/GeneratePage.tsx b/apps/web/src/pages/generate/GeneratePage.tsx
index a3adf2bbe..ec513f211 100644
--- a/apps/web/src/pages/generate/GeneratePage.tsx
+++ b/apps/web/src/pages/generate/GeneratePage.tsx
@@ -84,12 +84,16 @@ const GeneratePage: React.FC = () => {
   const [previewCount, setPreviewCount] = useState(1)
 
   /* ── 根据 voiceMode 构建 voiceIds 传给预览接口 ── */
-  const previewVoiceIds = useMemo(() => {
+  /* selectedVoice / selectedClonedVoice 均为 string 类型（voice ID），
+     见 useGenerateFormState 返回值类型定义 */
+  const previewVoiceIds = useMemo((): string[] => {
     if (voiceMode === "clone") {
-      return selectedClonedVoice ? [String(selectedClonedVoice)] : []
+      const id: string = selectedClonedVoice
+      return id ? [id] : []
     }
     // preset / custom 模式
-    return selectedVoice ? [String(selectedVoice)] : []
+    const id: string = selectedVoice
+    return id ? [id] : []
   }, [voiceMode, selectedVoice, selectedClonedVoice])
 
   /* ── Step4 预览生成（多预览 + voice_ids） ── */