diff --git a/python/paddle/dataset/cifar.py b/python/paddle/dataset/cifar.py
index cc6384e74c4c563ed1662a9d68fb0a1a67ec68b4..f6b4ff8fbd0f83b1d652d37c1b2d04efd3c73cbb 100644
--- a/python/paddle/dataset/cifar.py
+++ b/python/paddle/dataset/cifar.py
@@ -28,11 +28,12 @@ images per class.
 
 """
 
-import pickle
 import itertools
 import numpy
 import paddle.dataset.common
 import tarfile
+from six.moves import zip
+from six.moves import cPickle as pickle
 
 __all__ = ['train100', 'test100', 'train10', 'test10', 'convert']
 
diff --git a/python/paddle/dataset/common.py b/python/paddle/dataset/common.py
index 771577c89d987bc9a4442f3177a8663a2741e57a..a892287dbc8af309fd488a714bfb7e3f15cdb2ae 100644
--- a/python/paddle/dataset/common.py
+++ b/python/paddle/dataset/common.py
@@ -20,9 +20,8 @@ import shutil
 import sys
 import importlib
 import paddle.dataset
-import pickle
+import six.moves.cPickle as pickle
 import glob
-import pickle as pickle
 
 __all__ = [
     'DATA_HOME',
diff --git a/python/paddle/dataset/conll05.py b/python/paddle/dataset/conll05.py
index 466344cc9dbe8994552fdf64194e6374352df857..25623feabb89617e4272789a8ddd11da3409811c 100644
--- a/python/paddle/dataset/conll05.py
+++ b/python/paddle/dataset/conll05.py
@@ -24,6 +24,7 @@ import tarfile
 import gzip
 import itertools
 import paddle.dataset.common
+from six.moves import zip
 
 __all__ = ['test, get_dict', 'get_embedding', 'convert']
 
diff --git a/python/paddle/dataset/flowers.py b/python/paddle/dataset/flowers.py
index db9be0c04bbd5c3ff57855b42378848de9c92b0a..914dae348bc94d061072543aa14aba2219f4b52d 100644
--- a/python/paddle/dataset/flowers.py
+++ b/python/paddle/dataset/flowers.py
@@ -28,7 +28,6 @@ Graphics and Image Processing (2008)
 http://www.robots.ox.ac.uk/~vgg/publications/papers/nilsback08.{pdf,ps.gz}.
 
 """
-import pickle
 import itertools
 import functools
 from .common import download
@@ -39,6 +38,8 @@ from paddle.reader import *
 import os
 import numpy as np
 from multiprocessing import cpu_count
+from six.moves import cPickle as pickle
+from six.moves import zip
 __all__ = ['train', 'test', 'valid']
 
 DATA_URL = 'http://www.robots.ox.ac.uk/~vgg/data/flowers/102/102flowers.tgz'
diff --git a/python/paddle/dataset/image.py b/python/paddle/dataset/image.py
index 3048dfd518250d7680916009eb39e98960f42348..3b3d89c93c48d611dccf6f14958c310a6cac1a7b 100644
--- a/python/paddle/dataset/image.py
+++ b/python/paddle/dataset/image.py
@@ -36,7 +36,7 @@ except ImportError:
     cv2 = None
 import os
 import tarfile
-import pickle
+import six.moves.cPickle as pickle
 
 __all__ = [
     "load_image_bytes", "load_image", "resize_short", "to_chw", "center_crop",
diff --git a/python/paddle/fluid/framework.py b/python/paddle/fluid/framework.py
index 53658610e55f6433dafe07547dc4f0fbb49493e2..3cfbe8cebf8faf8d2d852f1dfa9f11b61bd977b7 100644
--- a/python/paddle/fluid/framework.py
+++ b/python/paddle/fluid/framework.py
@@ -963,9 +963,9 @@ class Block(object):
         raise ValueError("Var {0} is not found recursively".format(name))
 
     def all_parameters(self):
-        return list(self.iter_parameters())
+        return list(self._iter_parameters())
 
-    def iter_parameters(self):
+    def _iter_parameters(self):
         return (item[1] for item in list(self.vars.items())
                 if isinstance(item[1], Parameter))
 
@@ -1199,7 +1199,7 @@ class Block(object):
         if not isinstance(other, Block):
             raise TypeError(
                 "_copy_param_info_from should be invoked with Block")
-        for p in other.iter_parameters():
+        for p in other._iter_parameters():
             assert isinstance(p, Parameter)
             v = self.vars.get(p.name, None)
             if v is None:
diff --git a/python/paddle/fluid/layer_helper.py b/python/paddle/fluid/layer_helper.py
index 5f2ff3c9c874d70820e54028a231c07750891072..715c562516bacd760792bca673f2389fd6fbd7a3 100644
--- a/python/paddle/fluid/layer_helper.py
+++ b/python/paddle/fluid/layer_helper.py
@@ -20,6 +20,7 @@ from . import unique_name
 from paddle.fluid.initializer import Constant, Xavier
 from .param_attr import ParamAttr, WeightNormParamAttr
 from . import core
+from six.moves import zip
 
 
 class LayerHelper(object):
diff --git a/python/paddle/fluid/tests/book/high-level-api/image_classification/cifar10_small_test_set.py b/python/paddle/fluid/tests/book/high-level-api/image_classification/cifar10_small_test_set.py
index ebbe09d098880b1459826ca82a73fd2cca62d6fa..9e4c384d92943227c2d68da829e6019e649a35fb 100644
--- a/python/paddle/fluid/tests/book/high-level-api/image_classification/cifar10_small_test_set.py
+++ b/python/paddle/fluid/tests/book/high-level-api/image_classification/cifar10_small_test_set.py
@@ -28,11 +28,12 @@ images per class.
 
 """
 
-import pickle
 import itertools
 import numpy
 import paddle.v2.dataset.common
 import tarfile
+from six.moves import cPickle as pickle
+from six.moves import zip
 
 __all__ = ['train10']
 
diff --git a/python/paddle/fluid/transpiler/memory_optimization_transpiler.py b/python/paddle/fluid/transpiler/memory_optimization_transpiler.py
index 907acb1cac12c2136de897e426224e898bcce662..20ba7ed2b0b9df0d0432727ee1f69f61533c402e 100644
--- a/python/paddle/fluid/transpiler/memory_optimization_transpiler.py
+++ b/python/paddle/fluid/transpiler/memory_optimization_transpiler.py
@@ -17,6 +17,7 @@ from .. import core
 from ..framework import Program, default_main_program, Parameter
 from ..backward import _rename_arg_
 from functools import reduce
+from six.moves import range
 
 dtype_to_size = {
     core.VarDesc.VarType.FP16: 2,
diff --git a/python/paddle/reader/creator.py b/python/paddle/reader/creator.py
index 12c3afbcb05fda608a5a147bb298cd94125a2a88..025338a2ae021cbeba1c21fdf74efc19d8320d12 100644
--- a/python/paddle/reader/creator.py
+++ b/python/paddle/reader/creator.py
@@ -67,7 +67,7 @@ def recordio(paths, buf_size=100):
 
     import recordio as rec
     import paddle.reader.decorator as dec
-    import pickle as pickle
+    import six.moves.cPickle as pickle
 
     def reader():
         if isinstance(paths, str):
diff --git a/python/paddle/reader/decorator.py b/python/paddle/reader/decorator.py
index 7faca28e400af64e40b1cc9d09befa68efb1360f..ce410e61b92e7d3f32fa5bfeb415e4b6c5fa9df6 100644
--- a/python/paddle/reader/decorator.py
+++ b/python/paddle/reader/decorator.py
@@ -22,6 +22,8 @@ import subprocess
 
 from six.moves.queue import Queue
 from six.moves import zip_longest
+from six.moves import map
+from six.moves import zip
 import itertools
 import random
 import zlib
diff --git a/python/paddle/trainer/PyDataProviderWrapper.py b/python/paddle/trainer/PyDataProviderWrapper.py
index 6af250772859811b3c48434ab005e50b435dd320..374976db9f17ad9b1fd33c5d4adf77155336d100 100644
--- a/python/paddle/trainer/PyDataProviderWrapper.py
+++ b/python/paddle/trainer/PyDataProviderWrapper.py
@@ -42,7 +42,7 @@ except ImportError:
 try:
     import cPickle as pickle
 except ImportError:
-    import pickle
+    import six.moves.cPickle as pickle
 
 import io
 
diff --git a/python/paddle/trainer_config_helpers/data_sources.py b/python/paddle/trainer_config_helpers/data_sources.py
index ab9a2562dcccb394c0b24741ceeb10061e40cb9a..a2a32d848cbc4200397e6a12a3662419102da0a9 100644
--- a/python/paddle/trainer_config_helpers/data_sources.py
+++ b/python/paddle/trainer_config_helpers/data_sources.py
@@ -20,7 +20,7 @@ from .utils import deprecated
 try:
     import cPickle as pickle
 except ImportError:
-    import pickle
+    import six.moves.cPickle as pickle
 
 __all__ = ['define_py_data_sources2']
 
diff --git a/python/paddle/trainer_config_helpers/layers.py b/python/paddle/trainer_config_helpers/layers.py
index d9787ef42a31b8dfd1836e7a01d5664049cc66b5..ee34c157334b533b9c330b8103424964d7df510b 100644
--- a/python/paddle/trainer_config_helpers/layers.py
+++ b/python/paddle/trainer_config_helpers/layers.py
@@ -28,7 +28,7 @@ from .default_decorators import *
 try:
     import cPickle as pickle
 except ImportError:
-    import pickle
+    import six.moves.cPickle as pickle
 import copy
 
 __all__ = [