diff --git a/doc/api/trainer_config_helpers/layers.rst b/doc/api/trainer_config_helpers/layers.rst
index 4e429650e545179eca2f947e4af660222ad7cda8..8b0e553eacc932bc59062103ac6e6ac4245d03cb 100644
--- a/doc/api/trainer_config_helpers/layers.rst
+++ b/doc/api/trainer_config_helpers/layers.rst
@@ -382,6 +382,15 @@ sampling_id_layer
     :members: sampling_id_layer
     :noindex:
 
+Slicing and Joining Layers
+==========================
+
+pad_layer
+-----------
+..  automodule:: paddle.trainer_config_helpers.layers
+    :members: pad_layer
+    :noindex:
+
 ..  _api_trainer_config_helpers_layers_cost_layers:
 
 Cost Layers
diff --git a/python/paddle/trainer_config_helpers/layers.py b/python/paddle/trainer_config_helpers/layers.py
index 4e4744b518d8590acf43928d0ddebd7aacfdc224..66817fc93be43b20460365403bd5e41c197f250c 100644
--- a/python/paddle/trainer_config_helpers/layers.py
+++ b/python/paddle/trainer_config_helpers/layers.py
@@ -108,6 +108,7 @@ __all__ = [
     'print_layer',
     'priorbox_layer',
     'spp_layer',
+    'pad_layer',
 ]