diff --git a/x2paddle/decoder/caffe_decoder.py b/x2paddle/decoder/caffe_decoder.py
index d6a925170d259332e7d1cc7f89bf935696ceca16..e4bd86c4833944ea325868f5770b61e836b90843 100644
--- a/x2paddle/decoder/caffe_decoder.py
+++ b/x2paddle/decoder/caffe_decoder.py
@@ -27,11 +27,18 @@ class CaffeResolver(object):
         self.import_caffe()
 
     def import_caffepb(self):
-        (filepath,
-         tempfilename) = os.path.split(os.path.abspath(self.caffe_proto))
-        (filename, extension) = os.path.splitext(tempfilename)
-        sys.path.append(filepath)
-        out = __import__(filename)
+        if self.caffe_proto is None:
+            from x2paddle.decoder import caffe_pb2
+            out = caffe_pb2
+        else:
+            if not os.path.isfile(self.caffe_proto):
+                raise Exception(
+                    "The .py file compiled by caffe.proto is not exist.")
+            (filepath,
+             tempfilename) = os.path.split(os.path.abspath(self.caffe_proto))
+            (filename, extension) = os.path.splitext(tempfilename)
+            sys.path.append(filepath)
+            out = __import__(filename)
         return out
 
     def import_caffe(self):
@@ -146,11 +153,6 @@ class CaffeDecoder(object):
     def __init__(self, proto_path, model_path, caffe_proto):
         self.proto_path = proto_path
         self.model_path = model_path
-        if caffe_proto is None:
-            caffe_proto = './x2paddle/decoder/caffe_pb2.py'
-        if caffe_proto is not None and not os.path.isfile(caffe_proto):
-            raise Exception(
-                "The .py file compiled by caffe.proto is not exist.")
 
         self.resolver = CaffeResolver(caffe_proto=caffe_proto)
         self.net = self.resolver.NetParameter()