diff --git a/runtime/datamate-python/app/module/annotation/interface/export.py b/runtime/datamate-python/app/module/annotation/interface/export.py
index 5fca342..395635d 100644
--- a/runtime/datamate-python/app/module/annotation/interface/export.py
+++ b/runtime/datamate-python/app/module/annotation/interface/export.py
@@ -11,6 +11,8 @@
 
 from __future__ import annotations
 
+from urllib.parse import quote
+
 from fastapi import APIRouter, Depends, Path, Query
 from fastapi.responses import Response
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -79,11 +81,15 @@ async def download_annotations(
         request=request,
     )
 
+    # RFC 5987: 使用 filename* 支持 UTF-8 编码的文件名
+    encoded_filename = quote(filename, safe="")
+    content_disposition = f"attachment; filename*=UTF-8''{encoded_filename}"
+
     return Response(
         content=content,
         media_type=content_type,
         headers={
-            "Content-Disposition": f'attachment; filename="{filename}"',
+            "Content-Disposition": content_disposition,
             "Content-Length": str(len(content)),
         },
     )