diff --git a/qcloud_cos/cos_client.py b/qcloud_cos/cos_client.py
index 417cf11f..324c2a04 100644
--- a/qcloud_cos/cos_client.py
+++ b/qcloud_cos/cos_client.py
@@ -598,10 +598,6 @@ def upload_part(self, Bucket, Key, Body, PartNumber, UploadId, EnableMD5=False,
                 auth=CosS3Auth(self._conf._secret_id, self._conf._secret_key, Key),
                 data=Body)
         response = dict()
-        logger.debug("local md5: {key}".format(key=rt.headers['ETag'][1:-1]))
-        logger.debug("cos md5: {key}".format(key=md5(Body).hexdigest()))
-        if md5(Body).hexdigest() != rt.headers['ETag'][1:-1]:
-            raise CosClientError("MD5 inconsistencies")
         response['ETag'] = rt.headers['ETag']
         return response