diff --git a/x2paddle/core/fluid_code.py b/x2paddle/core/fluid_code.py
index 42b51f117143cd7a3f7b3a579d2ba6c4e2f33a74..5619e087260397128de3e12563ed1cf9c776f945 100644
--- a/x2paddle/core/fluid_code.py
+++ b/x2paddle/core/fluid_code.py
@@ -13,8 +13,9 @@
 # limitations under the License.
 
 from x2paddle.core.graph import GraphNode
-import collections
 from x2paddle.core.util import *
+import collections
+import six
 
 
 class Layer(object):
@@ -28,7 +29,7 @@ class Layer(object):
     def get_code(self):
         layer_code = ""
         if self.output is not None:
-            if isinstance(self.output, str):
+            if isinstance(self.output, six.string_types):
                 layer_code = self.output + " = "
             else:
                 layer_code = self.output.layer_name + " = "
@@ -47,7 +48,7 @@ class Layer(object):
                                     "[{}]".format(input.index) + ", ")
                     else:
                         in_list += (input.layer_name + ", ")
-                elif isinstance(input, str):
+                elif isinstance(input, six.string_types):
                     in_list += (input + ", ")
                 else:
                     raise Exception(
@@ -72,7 +73,7 @@ class Layer(object):
                                "[{}]".format(self.inputs.index) + ", ")
             else:
                 layer_code += (self.inputs.layer_name + ", ")
-        elif isinstance(self.inputs, str):
+        elif isinstance(self.inputs, six.string_types):
             layer_code += (self.inputs + ", ")
         else:
             raise Exception("Unknown type of inputs.")
@@ -119,6 +120,6 @@ class FluidCode(object):
         for layer in self.layers:
             if isinstance(layer, Layer):
                 codes.append(layer.get_code())
-            elif isinstance(layer, str):
+            elif isinstance(layer, six.string_types):
                 codes.append(layer)
         return codes
diff --git a/x2paddle/core/graph.py b/x2paddle/core/graph.py
index 3165dcd1d9ea26ff39408c3628de8ba982c4657b..6ca6c47f5899233ba93953ba915e3c79a093c7c2 100644
--- a/x2paddle/core/graph.py
+++ b/x2paddle/core/graph.py
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import print_function
+from __future__ import division
 import collections
 import copy as cp
 
diff --git a/x2paddle/decoder/caffe_decoder.py b/x2paddle/decoder/caffe_decoder.py
index 9573d10409064245fe33338d5ac8394604487ae1..ea9d3bc76c06f976b082838b1d794e95ac3488d0 100644
--- a/x2paddle/decoder/caffe_decoder.py
+++ b/x2paddle/decoder/caffe_decoder.py
@@ -236,11 +236,7 @@ class CaffeDecoder(object):
         data.MergeFromString(open(self.model_path, 'rb').read())
         pair = lambda layer: (layer.name, self.normalize_pb_data(layer))
         layers = data.layers or data.layer
-        import time
-        start = time.time()
         self.params = [pair(layer) for layer in layers if layer.blobs]
-        end = time.time()
-        print('cost:', str(end - start))
 
     def normalize_pb_data(self, layer):
         transformed = []
diff --git a/x2paddle/op_mapper/onnx_op_mapper.py b/x2paddle/op_mapper/onnx_op_mapper.py
index a2d8941a3276eb164bb496f6f0e7a6f4448265d3..4dcc922c15d21612d409dd2e568ca83335c7e194 100644
--- a/x2paddle/op_mapper/onnx_op_mapper.py
+++ b/x2paddle/op_mapper/onnx_op_mapper.py
@@ -94,7 +94,7 @@ class ONNXOpMapper(OpMapper):
                 print(op)
             return False
 
-    def directly_map(self, node, *args, name='', **kwargs):
+    def directly_map(self, node, name='', *args, **kwargs):
         inputs = node.layer.input
         outputs = node.layer.output
         op_type = node.layer_type