diff --git a/demo/mnist/api_train.py b/demo/mnist/api_train.py
index 25c25c1fcddd26b10db7501dae9c5c865f818dd6..ea1caa7dd9653a2cc2860ace736fe3d25a3767e0 100644
--- a/demo/mnist/api_train.py
+++ b/demo/mnist/api_train.py
@@ -71,9 +71,9 @@ def main():
 
     # define network
     images = paddle_v2.layer.data(
-        name='pixel', type=paddle_v2.data.dense_vector(784))
+        name='pixel', type=paddle_v2.data_type.dense_vector(784))
     label = paddle_v2.layer.data(
-        name='label', type=paddle_v2.data.integer_value(10))
+        name='label', type=paddle_v2.data_type.integer_value(10))
     hidden1 = paddle_v2.layer.fc(input=images, size=200)
     hidden2 = paddle_v2.layer.fc(input=hidden1, size=200)
     inference = paddle_v2.layer.fc(input=hidden2,
diff --git a/demo/mnist/api_train_v2.py b/demo/mnist/api_train_v2.py
index c50a46c4d82447e3d48818b8170a55b94d09c467..6fc01ce58be57c77144c6558d039430b22d3a746 100644
--- a/demo/mnist/api_train_v2.py
+++ b/demo/mnist/api_train_v2.py
@@ -15,8 +15,10 @@ def main():
     paddle.init(use_gpu=False, trainer_count=1)
 
     # define network topology
-    images = paddle.layer.data(name='pixel', type=paddle.data.dense_vector(784))
-    label = paddle.layer.data(name='label', type=paddle.data.integer_value(10))
+    images = paddle.layer.data(
+        name='pixel', type=paddle.data_type.dense_vector(784))
+    label = paddle.layer.data(
+        name='label', type=paddle.data_type.integer_value(10))
     hidden1 = paddle.layer.fc(input=images, size=200)
     hidden2 = paddle.layer.fc(input=hidden1, size=200)
     inference = paddle.layer.fc(input=hidden2,
diff --git a/python/paddle/v2/__init__.py b/python/paddle/v2/__init__.py
index cd6dfce0e66765120e3ddba00fe288aae4b43f43..c0a2bdc4259c3f48e8e7fdf4c8d8b2584253875a 100644
--- a/python/paddle/v2/__init__.py
+++ b/python/paddle/v2/__init__.py
@@ -17,12 +17,12 @@ import activation
 import parameters
 import trainer
 import event
-import data
+import data_type
 import py_paddle.swig_paddle as api
 
 __all__ = [
     'optimizer', 'layer', 'activation', 'parameters', 'init', 'trainer',
-    'event', 'data'
+    'event', 'data_type.py'
 ]
 
 
diff --git a/python/paddle/v2/data.py b/python/paddle/v2/data_type.py
similarity index 100%
rename from python/paddle/v2/data.py
rename to python/paddle/v2/data_type.py
diff --git a/python/paddle/v2/layer.py b/python/paddle/v2/layer.py
index f5a411198e47ab46bd720852a14cfa58955eddce..4d052c983c2c07730fe5111ccb961de68e73fb8f 100644
--- a/python/paddle/v2/layer.py
+++ b/python/paddle/v2/layer.py
@@ -67,7 +67,7 @@ paddle.v2.parameters.create, no longer exposed to users.
 """
 
 import paddle.trainer_config_helpers as conf_helps
-from . import data as v2_data
+from . import data_type as v2_data
 from paddle.trainer_config_helpers.config_parser_utils import \
     parse_network_config as __parse__
 from paddle.trainer_config_helpers.default_decorators import wrap_name_default