diff --git a/apps/web/src/pages/generate/components/Step4GeneratePreview.tsx b/apps/web/src/pages/generate/components/Step4GeneratePreview.tsx
index 1b04ee2db..a3a986632 100644
--- a/apps/web/src/pages/generate/components/Step4GeneratePreview.tsx
+++ b/apps/web/src/pages/generate/components/Step4GeneratePreview.tsx
@@ -42,7 +42,7 @@ const PREVIEW_COUNT_OPTIONS = [
 const Step4GeneratePreview: React.FC<Step4GeneratePreviewProps> = ({
   templateName: _templateName,
   materialCount: _materialCount,
-  videoRatio: _videoRatio,
+  videoRatio,
   previewCount,
   onPreviewCountChange,
   items,
@@ -55,6 +55,7 @@ const Step4GeneratePreview: React.FC<Step4GeneratePreviewProps> = ({
   onGeneratePreview,
   onRegeneratePreview,
 }) => {
+  const aspectRatio = (videoRatio || "16:9").replace(":", "/") // "9:16" → "9/16", "16:9" → "16/9"
   const isIdle = overallStatus === "idle"
   const isError = overallStatus === "error" && !items.some((it) => it.status === "ready")
 
@@ -161,8 +162,7 @@ const Step4GeneratePreview: React.FC<Step4GeneratePreviewProps> = ({
                 {/* 缩略图/状态区域 */}
                 <div
                   style={{
-                    aspectRatio: "9/16",
-                    maxHeight: 180,
+                    aspectRatio,
                     background: "#000",
                     display: "flex",
                     alignItems: "center",