diff --git a/caffe2fluid/kaffe/caffe/resolver.py b/caffe2fluid/kaffe/caffe/resolver.py
index e67be41f6455b1ef43c9ecf209ac4f0d220c512c..4ff3a9d6acbef7f5732a8bdee6c1903b70392870 100644
--- a/caffe2fluid/kaffe/caffe/resolver.py
+++ b/caffe2fluid/kaffe/caffe/resolver.py
@@ -6,14 +6,20 @@ SHARED_CAFFE_RESOLVER = None
 
 
 def import_caffepb():
-    p = os.path.realpath(__file__)
+   p = os.path.realpath(__file__)
     p = os.path.dirname(p)
     p = os.path.join(p, '../../proto')
     sys.path.insert(0, p)
-    pb_version = subprocess.getstatusoutput('protoc --version')[1]
+    s = sys.version
+    if s.startswith('2'):
+        import commands
+        pb_version = commands.getstatusoutput('protoc --version')[1]
+    else:
+        import subprocess
+        pb_version = subprocess.getstatusoutput('protoc --version')[1]
     ver_str = pb_version.split(' ')[-1].replace('.', '')
     ver_int = int(ver_str)
-    assert vaer_int >= 360, 'The version of protobuf must be larger than 3.6.0!'
+    assert ver_int >= 360, 'The version of protobuf must be larger than 3.6.0!'
     import caffe_pb2
     return caffe_pb2