diff --git a/python/paddle/v2/dataset/cifar.py b/python/paddle/v2/dataset/cifar.py
index c38caf7a897cd5d2d06cfd517dd63bebf56eecd8..3a8b98b8f045b0eb58be69649486cbd0a571f118 100644
--- a/python/paddle/v2/dataset/cifar.py
+++ b/python/paddle/v2/dataset/cifar.py
@@ -20,7 +20,7 @@ TODO(yuyang18): Complete the comments.
 import cPickle
 import itertools
 import numpy
-import paddle.v2.dataset.common
+from common import download
 import tarfile
 
 __all__ = ['train100', 'test100', 'train10', 'test10']
@@ -55,28 +55,23 @@ def reader_creator(filename, sub_name):
 
 def train100():
     return reader_creator(
-        paddle.v2.dataset.common.download(CIFAR100_URL, 'cifar', CIFAR100_MD5),
-        'train')
+        download(CIFAR100_URL, 'cifar', CIFAR100_MD5), 'train')
 
 
 def test100():
-    return reader_creator(
-        paddle.v2.dataset.common.download(CIFAR100_URL, 'cifar', CIFAR100_MD5),
-        'test')
+    return reader_creator(download(CIFAR100_URL, 'cifar', CIFAR100_MD5), 'test')
 
 
 def train10():
     return reader_creator(
-        paddle.v2.dataset.common.download(CIFAR10_URL, 'cifar', CIFAR10_MD5),
-        'data_batch')
+        download(CIFAR10_URL, 'cifar', CIFAR10_MD5), 'data_batch')
 
 
 def test10():
     return reader_creator(
-        paddle.v2.dataset.common.download(CIFAR10_URL, 'cifar', CIFAR10_MD5),
-        'test_batch')
+        download(CIFAR10_URL, 'cifar', CIFAR10_MD5), 'test_batch')
 
 
-def fetch_data():
-    paddle.v2.dataset.common.download(CIFAR10_URL, 'cifar', CIFAR10_MD5)
-    paddle.v2.dataset.common.download(CIFAR100_URL, 'cifar', CIFAR100_MD5)
+def fetch():
+    download(CIFAR10_URL, 'cifar', CIFAR10_MD5)
+    download(CIFAR100_URL, 'cifar', CIFAR100_MD5)
diff --git a/python/paddle/v2/dataset/common.py b/python/paddle/v2/dataset/common.py
index 3021b68ddb02ecaa874e21681796c0912ad4cc06..7021a6da05dec6be216534112c2df2586e73390f 100644
--- a/python/paddle/v2/dataset/common.py
+++ b/python/paddle/v2/dataset/common.py
@@ -17,6 +17,8 @@ import hashlib
 import os
 import shutil
 import sys
+import importlib
+import paddle.v2.dataset
 
 __all__ = ['DATA_HOME', 'download', 'md5file']
 
@@ -69,3 +71,13 @@ def dict_add(a_dict, ele):
         a_dict[ele] += 1
     else:
         a_dict[ele] = 1
+
+
+def fetch_all():
+    for module_name in filter(lambda x: not x.startswith("__"),
+                              dir(paddle.v2.dataset)):
+        if "fetch" in dir(
+                importlib.import_module("paddle.v2.dataset.%s" % module_name)):
+            getattr(
+                importlib.import_module("paddle.v2.dataset.%s" % module_name),
+                "fetch")()
diff --git a/python/paddle/v2/dataset/conll05.py b/python/paddle/v2/dataset/conll05.py
index dede47cbd39b240d7b57de12ca4144b1fc97e2e1..f1b0ce16f21ad13d4564242c2359355236093032 100644
--- a/python/paddle/v2/dataset/conll05.py
+++ b/python/paddle/v2/dataset/conll05.py
@@ -198,9 +198,9 @@ def test():
     return reader_creator(reader, word_dict, verb_dict, label_dict)
 
 
-def fetch_data():
-    paddle.v2.dataset.common.download(WORDDICT_URL, 'conll05st', WORDDICT_MD5)
-    paddle.v2.dataset.common.download(VERBDICT_URL, 'conll05st', VERBDICT_MD5)
-    paddle.v2.dataset.common.download(TRGDICT_URL, 'conll05st', TRGDICT_MD5)
-    paddle.v2.dataset.common.download(EMB_URL, 'conll05st', EMB_MD5)
-    paddle.v2.dataset.common.download(DATA_URL, 'conll05st', DATA_MD5)
+def fetch():
+    download(WORDDICT_URL, 'conll05st', WORDDICT_MD5)
+    download(VERBDICT_URL, 'conll05st', VERBDICT_MD5)
+    download(TRGDICT_URL, 'conll05st', TRGDICT_MD5)
+    download(EMB_URL, 'conll05st', EMB_MD5)
+    download(DATA_URL, 'conll05st', DATA_MD5)
diff --git a/python/paddle/v2/dataset/imdb.py b/python/paddle/v2/dataset/imdb.py
index 05e67f39d14db849091002eabc1a5216322e56cd..5284017ce08de8beb559f58fb6006639f40f5580 100644
--- a/python/paddle/v2/dataset/imdb.py
+++ b/python/paddle/v2/dataset/imdb.py
@@ -125,5 +125,5 @@ def word_dict():
         re.compile("aclImdb/((train)|(test))/((pos)|(neg))/.*\.txt$"), 150)
 
 
-def fetch_data():
+def fetch():
     paddle.v2.dataset.common.download(URL, 'imdb', MD5)
diff --git a/python/paddle/v2/dataset/imikolov.py b/python/paddle/v2/dataset/imikolov.py
index b89628cea5b701f469dbf43756ea4b5bcac2a8b0..2931d06e7eb65bde887c56a8bc20e7a9c5e4d4e4 100644
--- a/python/paddle/v2/dataset/imikolov.py
+++ b/python/paddle/v2/dataset/imikolov.py
@@ -91,5 +91,5 @@ def test(word_idx, n):
     return reader_creator('./simple-examples/data/ptb.valid.txt', word_idx, n)
 
 
-def fetch_data():
+def fetch():
     paddle.v2.dataset.common.download(URL, "imikolov", MD5)
diff --git a/python/paddle/v2/dataset/mnist.py b/python/paddle/v2/dataset/mnist.py
index 8f1ce4df25eb8a995392d5fb23875ba1508e9081..48a39b5493a8004d6eb034498a797af9c662bd19 100644
--- a/python/paddle/v2/dataset/mnist.py
+++ b/python/paddle/v2/dataset/mnist.py
@@ -108,6 +108,8 @@ def test():
                                           TEST_LABEL_MD5), 100)
 
 
-def fetch_data():
+def fetch():
     paddle.v2.dataset.common.download(TRAIN_IMAGE_URL, 'mnist', TRAIN_IMAGE_MD5)
     paddle.v2.dataset.common.download(TRAIN_LABEL_URL, 'mnist', TRAIN_LABEL_MD5)
+    paddle.v2.dataset.common.download(TEST_IMAGE_URL, 'mnist', TEST_IMAGE_MD5)
+    paddle.v2.dataset.common.download(TEST_LABEL_URL, 'mnist', TRAIN_LABEL_MD5)
diff --git a/python/paddle/v2/dataset/movielens.py b/python/paddle/v2/dataset/movielens.py
index cebf8a13ec25868098e51d85681928a07e56b484..e148ddeca0370cd76128a31ce3a4d488e9737d98 100644
--- a/python/paddle/v2/dataset/movielens.py
+++ b/python/paddle/v2/dataset/movielens.py
@@ -205,8 +205,8 @@ def unittest():
     print train_count, test_count
 
 
-def fetch_data():
-    paddle.v2.dataset.common.download(URL, "movielens", MD5)
+def fetch():
+    download(URL, "movielens", MD5)
 
 
 if __name__ == '__main__':
diff --git a/python/paddle/v2/dataset/sentiment.py b/python/paddle/v2/dataset/sentiment.py
index 3183288a7ae4e60c79d68c11eb5945f85e73374f..0eeb6d5affd8c280fb74edc82cf24bf418ca8ef9 100644
--- a/python/paddle/v2/dataset/sentiment.py
+++ b/python/paddle/v2/dataset/sentiment.py
@@ -26,7 +26,7 @@ from itertools import chain
 import nltk
 from nltk.corpus import movie_reviews
 
-import paddle.v2.dataset.common
+import common
 
 __all__ = ['train', 'test', 'get_word_dict']
 NUM_TRAINING_INSTANCES = 1600
@@ -127,5 +127,5 @@ def test():
     return reader_creator(data_set[NUM_TRAINING_INSTANCES:])
 
 
-def fetch_data():
+def fetch():
     nltk.download('movie_reviews', download_dir=common.DATA_HOME)
diff --git a/python/paddle/v2/dataset/uci_housing.py b/python/paddle/v2/dataset/uci_housing.py
index 5066c0886bad0003638c59d058045a9cbd6d0384..dab8620441c966b19d8218025f8d8fa5b40d1c2c 100644
--- a/python/paddle/v2/dataset/uci_housing.py
+++ b/python/paddle/v2/dataset/uci_housing.py
@@ -91,5 +91,5 @@ def test():
     return reader
 
 
-def fetch_data():
-    paddle.v2.dataset.common.download(URL, 'uci_housing', MD5)
+def fetch():
+    download(URL, 'uci_housing', MD5)
diff --git a/python/paddle/v2/dataset/wmt14.py b/python/paddle/v2/dataset/wmt14.py
index 759c77ccfd0ee87866fa8add320f7c090354aed0..ee63a93f5ad918b5bbc949ae6ba29082b3f6abd5 100644
--- a/python/paddle/v2/dataset/wmt14.py
+++ b/python/paddle/v2/dataset/wmt14.py
@@ -16,7 +16,7 @@ wmt14 dataset
 """
 import tarfile
 
-import paddle.v2.dataset.common
+from paddle.v2.dataset.common import download
 
 __all__ = ['train', 'test', 'build_dict']
 
@@ -95,15 +95,13 @@ def reader_creator(tar_file, file_name, dict_size):
 
 def train(dict_size):
     return reader_creator(
-        paddle.v2.dataset.common.download(URL_TRAIN, 'wmt14', MD5_TRAIN),
-        'train/train', dict_size)
+        download(URL_TRAIN, 'wmt14', MD5_TRAIN), 'train/train', dict_size)
 
 
 def test(dict_size):
     return reader_creator(
-        paddle.v2.dataset.common.download(URL_TRAIN, 'wmt14', MD5_TRAIN),
-        'test/test', dict_size)
+        download(URL_TRAIN, 'wmt14', MD5_TRAIN), 'test/test', dict_size)
 
 
-def fetch_data():
-    paddle.v2.dataset.common.download(URL_TRAIN, 'wmt14', MD5_TRAIN)
+def fetch():
+    download(URL_TRAIN, 'wmt14', MD5_TRAIN)