diff --git a/x2paddle/decoder/onnx_backend.py b/x2paddle/decoder/onnx_backend.py
index bf06055da4b8e50469dc09136d05af6afdad57b4..aeebeb92731281302fb5334a88baf86e04c0360b 100644
--- a/x2paddle/decoder/onnx_backend.py
+++ b/x2paddle/decoder/onnx_backend.py
@@ -1,9 +1,23 @@
-## @package onnx
-# Module caffe2.python.onnx.backend
+#   Copyright (c) 2019  PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Part of the following code in this file refs to https://github.com/pytorch/pytorch/blob/master/caffe2/python/onnx/backend.py
+# PyTorch is BSD-style licensed, as found in the LICENSE file: https://github.com/pytorch/pytorch/blob/master/LICENSE
 """Backend for running ONNX on Caffe2
 
 To run this, you will need to have Caffe2 installed as well.
 """
+
 from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
diff --git a/x2paddle/op_mapper/onnx_custom_layer/InstanceNormalization.py b/x2paddle/op_mapper/onnx_custom_layer/InstanceNormalization.py
index 84a4bc3da942e023297364901440bda0e7982567..f93f7a723f17c927a26dc12a5f20a27f112546f2 100644
--- a/x2paddle/op_mapper/onnx_custom_layer/InstanceNormalization.py
+++ b/x2paddle/op_mapper/onnx_custom_layer/InstanceNormalization.py
@@ -1,3 +1,17 @@
+#   Copyright (c) 2019  PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from .register import register
 
 
diff --git a/x2paddle/op_mapper/onnx_custom_layer/__init__.py b/x2paddle/op_mapper/onnx_custom_layer/__init__.py
index b12eafebbb6455a27e6191ca03ec5dfad6e2a978..c21ce95ef487405e9cd93300b5e3831fe79c6dd4 100644
--- a/x2paddle/op_mapper/onnx_custom_layer/__init__.py
+++ b/x2paddle/op_mapper/onnx_custom_layer/__init__.py
@@ -1,3 +1,17 @@
+#   Copyright (c) 2019  PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from .register import get_registered_layers
 #custom layer import begins
 
diff --git a/x2paddle/op_mapper/onnx_custom_layer/register.py b/x2paddle/op_mapper/onnx_custom_layer/register.py
index 9600018bb5e45cc5811884626132af9dc1550721..ca3643c0497bba1a77fad8c2b819bbba08b8ba05 100644
--- a/x2paddle/op_mapper/onnx_custom_layer/register.py
+++ b/x2paddle/op_mapper/onnx_custom_layer/register.py
@@ -1,3 +1,16 @@
+#   Copyright (c) 2019  PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 """ this module provides 'register' for registering customized layers
 """