diff --git a/ppdet/experimental/__init__.py b/ppdet/experimental/__init__.py
index 5b9d75f99fa73d118808fb849ce6dd0934631775..f70396193135830ef2d1de8e357842ea1ef0eea2 100644
--- a/ppdet/experimental/__init__.py
+++ b/ppdet/experimental/__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 __future__ import absolute_import
 
 from .mixed_precision import *
diff --git a/ppdet/experimental/mixed_precision.py b/ppdet/experimental/mixed_precision.py
index 0de2f26c151a78fc5e23e14ef47dc6b39dccacc2..d8c333bf4b99b51857e47779b2f8998758cd0318 100644
--- a/ppdet/experimental/mixed_precision.py
+++ b/ppdet/experimental/mixed_precision.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 __future__ import absolute_import
 from __future__ import print_function