diff --git a/python/paddle_serving_server_gpu/__init__.py b/python/paddle_serving_server_gpu/__init__.py
index 8b02828d01c1810f63fcfe9cc9d24d0a1e82d6f1..0e5a49c4870956557c99fdf8abf08edf47bc4aa6 100644
--- a/python/paddle_serving_server_gpu/__init__.py
+++ b/python/paddle_serving_server_gpu/__init__.py
@@ -49,7 +49,7 @@ def serve_args():
     parser.add_argument(
         "--max_body_size",
         type=int,
-        default=64 * 1024 * 1024,
+        default=512 * 1024 * 1024,
         help="Limit sizes of messages")
     return parser.parse_args()