diff --git a/python/paddle_serving_app/reader/image_reader.py b/python/paddle_serving_app/reader/image_reader.py
index 7988bf447b5a0a075171d93d22dd1933aa8532b8..7f4a795513447d74e7f02d7741344ccae81c7c9d 100644
--- a/python/paddle_serving_app/reader/image_reader.py
+++ b/python/paddle_serving_app/reader/image_reader.py
@@ -296,7 +296,10 @@ class File2Image(object):
         pass
 
     def __call__(self, img_path):
-        fin = open(img_path)
+        if py_version == 2:
+            fin = open(img_path)
+        else:
+            fin = open(img_path, "rb")
         sample = fin.read()
         data = np.fromstring(sample, np.uint8)
         img = cv2.imdecode(data, cv2.IMREAD_COLOR)