diff --git a/apps/desktop/src/components/MaterialSegmentView.tsx b/apps/desktop/src/components/MaterialSegmentView.tsx
index 920865c..e164d1a 100644
--- a/apps/desktop/src/components/MaterialSegmentView.tsx
+++ b/apps/desktop/src/components/MaterialSegmentView.tsx
@@ -110,7 +110,7 @@ const playVideoSegment = async (filePath: string, startTime: number, endTime: nu
 const generateSegmentThumbnail = async (segment: SegmentWithDetails): Promise<string | null> => {
   try {
     // 使用片段的开始时间作为缩略图时间戳（首帧）
-    const timestamp = segment.segment.start_time;
+    const timestamp = 0;
 
     // 生成缩略图文件名
     const thumbnailFileName = `${segment.segment.id}_thumbnail.jpg`;