diff --git a/python/paddle_serving_server/serve.py b/python/paddle_serving_server/serve.py
index 63354f08ab71c9267388e2b45b3e6f931b6d0720..684af801cfb9c65b96ba4b0299e28444e11672c1 100644
--- a/python/paddle_serving_server/serve.py
+++ b/python/paddle_serving_server/serve.py
@@ -152,8 +152,8 @@ class MainService(BaseHTTPRequestHandler):
         if "key" not in post_data:
             return False
         else:
-            key = base64.b64decode(post_data["key"])
-            with open(args.model + "/key", "w") as f:
+            key = base64.b64decode(post_data["key"].encode())
+            with open(args.model + "/key", "wb") as f:
                 f.write(key)
             return True
 
@@ -161,8 +161,8 @@ class MainService(BaseHTTPRequestHandler):
         if "key" not in post_data:
             return False
         else:
-            key = base64.b64decode(post_data["key"])
-            with open(args.model + "/key", "r") as f:
+            key = base64.b64decode(post_data["key"].encode())
+            with open(args.model + "/key", "rb") as f:
                 cur_key = f.read()
             return (key == cur_key)
 
@@ -203,7 +203,7 @@ class MainService(BaseHTTPRequestHandler):
         self.send_response(200)
         self.send_header('Content-type', 'application/json')
         self.end_headers()
-        self.wfile.write(json.dumps(response))
+        self.wfile.write(json.dumps(response).encode())
 
 
 if __name__ == "__main__":