diff --git a/workflow/bilibiliupload/core.py b/workflow/bilibiliupload/core.py
index 4633b6f..d1d37b0 100644
--- a/workflow/bilibiliupload/core.py
+++ b/workflow/bilibiliupload/core.py
@@ -257,14 +257,11 @@ def upload_video_part(access_token, sid, mid, video_part: VideoPart, max_retry=5
         mid: member id.
         video_part: local video file data.
         max_retry: max retry number for each chunk.
-        cb: 回调
 
     Returns:
         status: success or fail.
         server_file_name: server file name by pre_upload api.
     """
-    if cb is None:
-        cb = lambda f, c, t: None
     if not isinstance(video_part, VideoPart):
         return False
     if video_part.server_file_name is not None: