diff --git a/python/paddle/dataset/cifar.py b/python/paddle/dataset/cifar.py
index f9fffe30477bdbc120332866e94202979440ebfa..579422887fe84a2b7a02de045d94b0b518f15a16 100644
--- a/python/paddle/dataset/cifar.py
+++ b/python/paddle/dataset/cifar.py
@@ -27,7 +27,6 @@ images per class.
 
 """
 
-import itertools
 import numpy
 import paddle.dataset.common
 import paddle.utils.deprecated as deprecated
diff --git a/python/paddle/dataset/common.py b/python/paddle/dataset/common.py
index 570704af73d03d4bf22b0c08ea09fd18a64b5402..a7aa2716917fd986091139fdb80ec01f41b865fe 100644
--- a/python/paddle/dataset/common.py
+++ b/python/paddle/dataset/common.py
@@ -17,7 +17,6 @@ import hashlib
 import os
 import errno
 import shutil
-import six
 import sys
 import importlib
 import paddle.dataset
@@ -55,7 +54,6 @@ def must_mkdirs(path):
     except OSError as exc:
         if exc.errno != errno.EEXIST:
             raise
-        pass
 
 
 must_mkdirs(DATA_HOME)
diff --git a/python/paddle/dataset/conll05.py b/python/paddle/dataset/conll05.py
index 2ddc3e4edc614ccece306d6f637a058201e02275..b98b5d4bde6f06da6ee2b38b6c1de47a6986fd39 100644
--- a/python/paddle/dataset/conll05.py
+++ b/python/paddle/dataset/conll05.py
@@ -22,7 +22,6 @@ to initialize SRL model.
 
 import tarfile
 import gzip
-import itertools
 import paddle.dataset.common
 import paddle.compat as cpt
 import paddle.utils.deprecated as deprecated
diff --git a/python/paddle/dataset/flowers.py b/python/paddle/dataset/flowers.py
index d905866e0f3ce8ceb420fdbc8863e4ac018e0a0a..42c0e7081d58efe7e45c750cd55f55335995d3ad 100644
--- a/python/paddle/dataset/flowers.py
+++ b/python/paddle/dataset/flowers.py
@@ -29,24 +29,16 @@ http://www.robots.ox.ac.uk/~vgg/publications/papers/nilsback08.{pdf,ps.gz}.
 
 """
 
-import itertools
 import functools
 from .common import download
 import tarfile
 
 from paddle.dataset.image import load_image_bytes
-from paddle.dataset.image import load_image
 from paddle.dataset.image import simple_transform
-from paddle.dataset.image import batch_images_from_tar
 
 from paddle.reader import map_readers, xmap_readers
-from paddle import compat as cpt
 import paddle.utils.deprecated as deprecated
-import os
-import numpy as np
 from multiprocessing import cpu_count
-import six
-from six.moves import cPickle as pickle
 from paddle.utils import try_import
 
 __all__ = []
diff --git a/python/paddle/dataset/movielens.py b/python/paddle/dataset/movielens.py
index f6dd853cc4e4bbedf9981c0e03742b0e2cfb0266..590d20b741fd350b3c1adc0846f8e93115cc9de8 100644
--- a/python/paddle/dataset/movielens.py
+++ b/python/paddle/dataset/movielens.py
@@ -27,7 +27,6 @@ import zipfile
 import paddle.dataset.common
 import paddle.utils.deprecated as deprecated
 import re
-import random
 import functools
 import six
 import paddle.compat as cpt
diff --git a/python/paddle/dataset/wmt14.py b/python/paddle/dataset/wmt14.py
index d71f2b6854917462bcb01b572370da13240393a4..cdc516bee2d24fecaa30298885ae07b70d5eb419 100644
--- a/python/paddle/dataset/wmt14.py
+++ b/python/paddle/dataset/wmt14.py
@@ -22,7 +22,6 @@ parse training set and test set into paddle reader creators.
 
 import six
 import tarfile
-import gzip
 
 import paddle.dataset.common
 import paddle.compat as cpt
diff --git a/python/paddle/dataset/wmt16.py b/python/paddle/dataset/wmt16.py
index 454c751f1ddf4d0070450bb4580e985e81e102f1..cc3857aca982a868ddaadd5be7b02e50274e7d67 100644
--- a/python/paddle/dataset/wmt16.py
+++ b/python/paddle/dataset/wmt16.py
@@ -31,7 +31,6 @@ Multi30K: Multilingual English-German Image Descriptions.
 import os
 import six
 import tarfile
-import gzip
 from collections import defaultdict
 
 import paddle
diff --git a/python/paddle/distribution/categorical.py b/python/paddle/distribution/categorical.py
index 7728f063c04c2f77f553bec76cfe92ae4d2694b5..269e2b5567196883f363fcc1baa223ef62f173e4 100644
--- a/python/paddle/distribution/categorical.py
+++ b/python/paddle/distribution/categorical.py
@@ -12,21 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import math
-import warnings
-
 import numpy as np
 import paddle
-from paddle import _C_ops, _legacy_C_ops
 from paddle.distribution import distribution
-from paddle.fluid import core
-from paddle.fluid.data_feeder import (check_dtype, check_type,
-                                      check_variable_and_dtype, convert_dtype)
-from paddle.fluid.framework import _non_static_mode, in_dygraph_mode
-from paddle.fluid.layers import (control_flow, elementwise_add, elementwise_div,
-                                 elementwise_mul, elementwise_sub, nn, ops,
-                                 tensor)
-from paddle.tensor import arange, concat, gather_nd, multinomial
+from paddle.fluid.data_feeder import (check_type, convert_dtype)
+from paddle.fluid.framework import _non_static_mode
+from paddle.fluid.layers import (ops, tensor)
+from paddle.tensor import multinomial
 
 
 class Categorical(distribution.Distribution):
diff --git a/python/paddle/distribution/distribution.py b/python/paddle/distribution/distribution.py
index d4fb4bffc841d45e649975e861469028eb8976da..14861d3794e3217de549011d3c5ec88805b97d7f 100644
--- a/python/paddle/distribution/distribution.py
+++ b/python/paddle/distribution/distribution.py
@@ -19,20 +19,14 @@
 #            'sampling_id',
 #            'Uniform']
 
-import math
 import warnings
 
 import numpy as np
 import paddle
 from paddle import _C_ops, _legacy_C_ops
-from paddle.fluid import core
-from paddle.fluid.data_feeder import (check_dtype, check_type,
-                                      check_variable_and_dtype, convert_dtype)
+from paddle.fluid.data_feeder import (check_variable_and_dtype, convert_dtype)
 from paddle.fluid.framework import _non_static_mode, in_dygraph_mode, _in_legacy_dygraph
-from paddle.fluid.layers import (control_flow, elementwise_add, elementwise_div,
-                                 elementwise_mul, elementwise_sub, nn, ops,
-                                 tensor)
-from paddle.tensor import arange, concat, gather_nd, multinomial
+from paddle.fluid.layers import tensor
 
 
 class Distribution(object):
diff --git a/python/paddle/distribution/exponential_family.py b/python/paddle/distribution/exponential_family.py
index 63019667fffa84e4b5b0d1806f308958e31acfcc..301c0cea13a582d31228cdc75a0c89c630223e70 100644
--- a/python/paddle/distribution/exponential_family.py
+++ b/python/paddle/distribution/exponential_family.py
@@ -14,7 +14,7 @@
 
 import paddle
 from paddle.distribution import distribution
-from paddle.fluid.framework import _non_static_mode, in_dygraph_mode
+from paddle.fluid.framework import _non_static_mode
 
 
 class ExponentialFamily(distribution.Distribution):
diff --git a/python/paddle/distribution/kl.py b/python/paddle/distribution/kl.py
index 80a093ad8b4915395d21f6929c6fb3dca6cc052f..aa288a57ba0b77deca879c70f40223443a259b0a 100644
--- a/python/paddle/distribution/kl.py
+++ b/python/paddle/distribution/kl.py
@@ -24,7 +24,7 @@ from paddle.distribution.normal import Normal
 from paddle.distribution.lognormal import LogNormal
 from paddle.distribution.uniform import Uniform
 from paddle.distribution.laplace import Laplace
-from paddle.fluid.framework import _non_static_mode, in_dygraph_mode
+from paddle.fluid.framework import _non_static_mode
 
 __all__ = ["register_kl", "kl_divergence"]
 
diff --git a/python/paddle/distribution/multinomial.py b/python/paddle/distribution/multinomial.py
index d960c6d8f6bbe9d3c497820f55ce21a2b1152cd4..22f8aa820f9936f69491531f4645e847f7db62ec 100644
--- a/python/paddle/distribution/multinomial.py
+++ b/python/paddle/distribution/multinomial.py
@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import collections
-
 import paddle
 from paddle.distribution import categorical, distribution
 try:
diff --git a/python/paddle/distribution/normal.py b/python/paddle/distribution/normal.py
index 33e36fbe72dac69bf76ded1ca35417e66db6d6c7..f76f13b250e4c82e149352b580a2cf76e6eddf1f 100644
--- a/python/paddle/distribution/normal.py
+++ b/python/paddle/distribution/normal.py
@@ -13,19 +13,13 @@
 # limitations under the License.
 
 import math
-import warnings
-
 import numpy as np
 import paddle
-from paddle import _C_ops, _legacy_C_ops
 from paddle.distribution import distribution
-from paddle.fluid import core
-from paddle.fluid.data_feeder import (check_dtype, check_type,
-                                      check_variable_and_dtype, convert_dtype)
-from paddle.fluid.framework import _non_static_mode, in_dygraph_mode
-from paddle.fluid.layers import (control_flow, elementwise_add, elementwise_div,
-                                 elementwise_mul, elementwise_sub, nn, ops,
-                                 tensor)
+from paddle.fluid.data_feeder import (check_type, convert_dtype)
+from paddle.fluid.framework import _non_static_mode
+from paddle.fluid.layers import (elementwise_add, elementwise_div,
+                                 elementwise_sub, nn, ops, tensor)
 try:
     from collections.abc import Iterable
 except:
diff --git a/python/paddle/distribution/transform.py b/python/paddle/distribution/transform.py
index ff2e13f94acf97387deed2dd70b5c5c48318518a..6cb0e048bab7e7219f2397cbd2351f36d7585d4d 100644
--- a/python/paddle/distribution/transform.py
+++ b/python/paddle/distribution/transform.py
@@ -15,7 +15,6 @@
 import enum
 import functools
 import math
-import numbers
 import operator
 import typing
 
diff --git a/python/paddle/distribution/uniform.py b/python/paddle/distribution/uniform.py
index 961d846a527c65f5aa6324e703d7749cbcc578b9..3c5655b27a4e62cf06dfe7f68200e8cb115efbee 100644
--- a/python/paddle/distribution/uniform.py
+++ b/python/paddle/distribution/uniform.py
@@ -12,20 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import math
-import warnings
-
 import numpy as np
 from paddle import _C_ops, _legacy_C_ops
 from paddle.distribution import distribution
-from paddle.fluid import core
-from paddle.fluid.data_feeder import (check_dtype, check_type,
-                                      check_variable_and_dtype, convert_dtype)
+from paddle.fluid.data_feeder import (check_type, convert_dtype)
 from paddle.fluid.framework import _non_static_mode, in_dygraph_mode, _in_legacy_dygraph
-from paddle.fluid.layers import (control_flow, elementwise_add, elementwise_div,
-                                 elementwise_mul, elementwise_sub, nn, ops,
-                                 tensor)
-from paddle.tensor import arange, concat, gather_nd, multinomial
+from paddle.fluid.layers import (elementwise_add, elementwise_div,
+                                 elementwise_sub, nn, tensor)
 
 
 class Uniform(distribution.Distribution):
diff --git a/python/paddle/nn/functional/activation.py b/python/paddle/nn/functional/activation.py
index 90a3748cd324d6776b4ea2031a11fc04c6231644..bcde1f064962bc25da2ca39390af2073bdc48ef6 100644
--- a/python/paddle/nn/functional/activation.py
+++ b/python/paddle/nn/functional/activation.py
@@ -18,12 +18,10 @@ from ...tensor.math import tanh_  # noqa: F401
 
 from ...fluid.dygraph.inplace_utils import inplace_apis_in_dygraph_only
 from ...tensor.manipulation import chunk
-from ...tensor.math import multiply
 
-import warnings
 from ...fluid.layer_helper import LayerHelper
 from ...fluid.framework import convert_np_dtype_to_dtype_
-from ...fluid.framework import _in_legacy_dygraph, in_dygraph_mode, _non_static_mode
+from ...fluid.framework import _in_legacy_dygraph, in_dygraph_mode
 from ...fluid.data_feeder import check_variable_and_dtype, check_dtype
 import paddle
 from paddle import _C_ops, _legacy_C_ops, in_dynamic_mode
diff --git a/python/paddle/nn/functional/common.py b/python/paddle/nn/functional/common.py
index 34818152f9a59130f52920c45b989855174b072f..2dc4db3026557e096e5eebd85ac71a5c19000179 100644
--- a/python/paddle/nn/functional/common.py
+++ b/python/paddle/nn/functional/common.py
@@ -12,14 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import warnings
 import paddle
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.fluid.layers.tensor import fill_constant
 from ...tensor import concat
 from ...tensor.creation import zeros
 from paddle.static import Variable
-from ...fluid import dygraph_utils
 # TODO: define the common functions to build a neural network
 from ...tensor.manipulation import squeeze
 from ...tensor.manipulation import unsqueeze
@@ -27,9 +25,7 @@ from ...tensor import clip
 from ...tensor import sum
 from ...tensor import sqrt
 from ...fluid.data_feeder import check_variable_and_dtype, check_dtype, check_type
-from ...fluid.framework import _varbase_creator, _in_legacy_dygraph, in_dygraph_mode, _non_static_mode
-
-from ...fluid import dygraph_utils
+from ...fluid.framework import _in_legacy_dygraph, _non_static_mode, in_dygraph_mode
 
 from paddle import _C_ops, _legacy_C_ops
 from paddle.framework import in_dynamic_mode
diff --git a/python/paddle/nn/functional/conv.py b/python/paddle/nn/functional/conv.py
index eacc22975f1e0a72a05896d32f34410a7d0b8914..17eded8ac06a8465c88cb4d6d60d9eecea628acb 100644
--- a/python/paddle/nn/functional/conv.py
+++ b/python/paddle/nn/functional/conv.py
@@ -12,16 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 from ...device import get_cudnn_version
 from ...static import Variable
-from ...fluid import dygraph_utils
 from ...fluid.layers.utils import convert_to_list, _is_symmetric_padding, _contain_var, _convert_to_tensor_list
 from ...fluid.data_feeder import check_variable_and_dtype, check_dtype
-from ...framework import ParamAttr
 from ...fluid.layer_helper import LayerHelper
 from ...tensor.manipulation import unsqueeze, squeeze
-from ...tensor.math import add
 from ...fluid.layers import nn
 from paddle import _C_ops, _legacy_C_ops
 from paddle import get_flags
@@ -34,7 +30,6 @@ from paddle.device import is_compiled_with_rocm
 from paddle.fluid.framework import _global_flags
 from paddle.fluid.framework import _in_legacy_dygraph
 from paddle.fluid.framework import in_dygraph_mode
-from paddle.fluid.framework import _non_static_mode
 
 __all__ = []
 
diff --git a/python/paddle/nn/functional/extension.py b/python/paddle/nn/functional/extension.py
index 682fa616d63a131d9fcfd4593204084f9bac8a4a..de3ffdf2bc8398ca603499d851a7ff472a8d7e1d 100644
--- a/python/paddle/nn/functional/extension.py
+++ b/python/paddle/nn/functional/extension.py
@@ -19,7 +19,6 @@ from ...fluid.data_feeder import check_dtype
 from ...fluid.layer_helper import LayerHelper
 from ...static import Variable
 from ...tensor.creation import assign
-from ...fluid import dygraph_utils
 from ...tensor.layer_function_generator import templatedoc
 from paddle import in_dynamic_mode
 from paddle import _C_ops, _legacy_C_ops
diff --git a/python/paddle/nn/functional/input.py b/python/paddle/nn/functional/input.py
index 57d4d8e39e3f67eeb0adf0cfa8d2adae0ad44c98..8df602e5c776d16d7dcde09be6f7bd0c12428888 100644
--- a/python/paddle/nn/functional/input.py
+++ b/python/paddle/nn/functional/input.py
@@ -12,12 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import warnings
 from ...static import Variable
 from ...fluid.layer_helper import LayerHelper
-from ...fluid.data_feeder import check_variable_and_dtype, check_dtype
+from ...fluid.data_feeder import check_variable_and_dtype
 from paddle import _C_ops, _legacy_C_ops
-from paddle import in_dynamic_mode
 from ...fluid.framework import _in_legacy_dygraph, in_dygraph_mode
 
 __all__ = []
diff --git a/python/paddle/nn/functional/loss.py b/python/paddle/nn/functional/loss.py
index b084b7db22a7a0c17a036a0d657cab401a025683..20b699c7a2798d2d60cca2528c586c292804e5e4 100755
--- a/python/paddle/nn/functional/loss.py
+++ b/python/paddle/nn/functional/loss.py
@@ -17,7 +17,6 @@ import paddle
 from ...fluid.data_feeder import check_variable_and_dtype
 
 # TODO: define loss functions of neural network
-import numpy as np
 import paddle
 import paddle.fluid as fluid
 from ...fluid.layers.nn import _elementwise_op_in_dygraph
diff --git a/python/paddle/nn/functional/norm.py b/python/paddle/nn/functional/norm.py
index 2b3517c900a5bb2cacf74c7f0fb7bc608601947b..d62dcdcfbf4f4059059019dc9e6d68afd5c8ee69 100644
--- a/python/paddle/nn/functional/norm.py
+++ b/python/paddle/nn/functional/norm.py
@@ -17,14 +17,11 @@ import paddle
 import paddle.fluid as fluid
 from ...fluid.data_feeder import check_variable_and_dtype, check_type
 from ...fluid.layer_helper import LayerHelper
-from ...framework import create_parameter
-from ..initializer import Constant
-from ...framework import ParamAttr
 from ...fluid import dygraph_utils
 import numbers
 from paddle import _C_ops, _legacy_C_ops
 from paddle import in_dynamic_mode
-from paddle.fluid.framework import core, _non_static_mode, in_dygraph_mode, _in_legacy_dygraph
+from paddle.fluid.framework import _in_legacy_dygraph, in_dygraph_mode
 
 __all__ = []
 
diff --git a/python/paddle/nn/functional/pooling.py b/python/paddle/nn/functional/pooling.py
index f3605b0f72bd67068e1b6202bf65e5d851ad1975..43c53c56e45e919876949dfa8ba1ac1687ad7e05 100755
--- a/python/paddle/nn/functional/pooling.py
+++ b/python/paddle/nn/functional/pooling.py
@@ -18,7 +18,6 @@ from ...tensor.manipulation import unsqueeze, squeeze
 from ...fluid.data_feeder import check_type, check_variable_and_dtype
 from paddle import _C_ops, _legacy_C_ops
 from paddle import in_dynamic_mode
-from paddle.fluid import core
 from paddle.fluid.framework import _in_legacy_dygraph, Variable
 from paddle.fluid.framework import in_dygraph_mode, _non_static_mode
 
diff --git a/python/paddle/nn/functional/sparse_attention.py b/python/paddle/nn/functional/sparse_attention.py
index cf5db83077eabc61bc3d369db4253befc6da6f55..87df72fe0ef2f3edd080cda9e8f89ae96c5c6d48 100644
--- a/python/paddle/nn/functional/sparse_attention.py
+++ b/python/paddle/nn/functional/sparse_attention.py
@@ -12,11 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import warnings
-import paddle
-from ...fluid.framework import default_main_program
 from paddle.fluid.layer_helper import LayerHelper
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 from paddle import in_dynamic_mode
 
 
diff --git a/python/paddle/nn/functional/vision.py b/python/paddle/nn/functional/vision.py
index 7f7a18d0a2ed27dcbebbbba9141b8b4e8f4aa2c8..af1656d641740b223f82a3e0ed393133adcdffe8 100644
--- a/python/paddle/nn/functional/vision.py
+++ b/python/paddle/nn/functional/vision.py
@@ -16,8 +16,6 @@ from ...device import get_cudnn_version
 from ...static import Variable
 from ...fluid.layer_helper import LayerHelper
 from ...fluid.data_feeder import check_variable_and_dtype
-from ...fluid import dygraph_utils
-import numpy as np
 from paddle import _C_ops, _legacy_C_ops
 from ...device import is_compiled_with_rocm
 from paddle import in_dynamic_mode
diff --git a/python/paddle/nn/initializer/dirac.py b/python/paddle/nn/initializer/dirac.py
index 26b2e4503713af4fdea7f19a22d7b416d7d34fc0..74fc285c6bbf3d46d9017503de6039cf1d67742c 100644
--- a/python/paddle/nn/initializer/dirac.py
+++ b/python/paddle/nn/initializer/dirac.py
@@ -19,7 +19,7 @@ from ...fluid import framework
 from ...fluid.framework import _current_expected_place
 from paddle import in_dynamic_mode
 from paddle.utils import unique_name
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 from ... import fluid
 
 __all__ = []
diff --git a/python/paddle/nn/initializer/orthogonal.py b/python/paddle/nn/initializer/orthogonal.py
index b8fe912a8399e7047470c6fdc9926a9c792174c2..65871ebad0b503613c0963bfeb0ae8762ead583d 100644
--- a/python/paddle/nn/initializer/orthogonal.py
+++ b/python/paddle/nn/initializer/orthogonal.py
@@ -15,10 +15,9 @@
 from ...fluid.initializer import Initializer
 from ...fluid.data_feeder import check_variable_and_dtype
 from ...fluid import framework
-from ...tensor import diag, transpose, sign, qr, reshape
 from paddle.utils import unique_name
 from ...fluid.dygraph import no_grad
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 
 __all__ = []
 
diff --git a/python/paddle/nn/layer/activation.py b/python/paddle/nn/layer/activation.py
index e397f40c82369a55e933c4218babf8a49281b47c..2382acbd0cab0a831b83c0b1b635a7bace2b8084 100644
--- a/python/paddle/nn/layer/activation.py
+++ b/python/paddle/nn/layer/activation.py
@@ -14,7 +14,6 @@
 
 # TODO: define activation functions of neural network
 
-from ...framework import ParamAttr
 from ..initializer import Constant
 from paddle.framework import get_default_dtype
 from .. import functional as F
diff --git a/python/paddle/nn/layer/common.py b/python/paddle/nn/layer/common.py
index 0bbcac444eb4634d1f9232f3ec773ebf41c4aac3..6cc2056459f81a8cbb1876b7134f2f5d3507e9ac 100644
--- a/python/paddle/nn/layer/common.py
+++ b/python/paddle/nn/layer/common.py
@@ -16,7 +16,6 @@
 import paddle
 from ...fluid.dygraph import Flatten  # noqa: F401
 from .. import functional as F
-from ...fluid.framework import _dygraph_tracer
 from paddle.nn import Layer
 from paddle import in_dynamic_mode
 
diff --git a/python/paddle/nn/layer/loss.py b/python/paddle/nn/layer/loss.py
index 8c80a82265f716d8c4a029c4484facfd1844d663..fea2add79b48d016b5cbb9da3e71607f1974a441 100644
--- a/python/paddle/nn/layer/loss.py
+++ b/python/paddle/nn/layer/loss.py
@@ -14,11 +14,10 @@
 # limitations under the License.
 
 # TODO: define loss functions of neural network
-import numpy as np
 import paddle.fluid as fluid
 import paddle
 from .. import functional as F
-from paddle.fluid.framework import _varbase_creator, in_dygraph_mode, _in_legacy_dygraph
+from paddle.fluid.framework import in_dygraph_mode
 from .. import Layer
 from paddle import in_dynamic_mode
 
diff --git a/python/paddle/nn/layer/norm.py b/python/paddle/nn/layer/norm.py
index fe553fd2741453310badc3460cd3be5fecb5ec8b..d011bfd34aa8a95ead0cb25c916314b2606e4b39 100644
--- a/python/paddle/nn/layer/norm.py
+++ b/python/paddle/nn/layer/norm.py
@@ -27,16 +27,14 @@
 
 # TODO: define normalization api
 
-import six
-
 from ...fluid.dygraph import BatchNorm  # noqa: F401
 from ...fluid.dygraph import SpectralNorm  # noqa: F401
 
-from ...framework import get_default_dtype, set_default_dtype, _non_static_mode
+from ...framework import get_default_dtype
 
 from ..initializer import Constant
 from ...framework import ParamAttr
-from ...fluid.data_feeder import check_variable_and_dtype, check_type
+from ...fluid.data_feeder import check_variable_and_dtype
 from ...fluid import dygraph_utils
 
 from ..functional import batch_norm, layer_norm, instance_norm
diff --git a/python/paddle/nn/layer/pooling.py b/python/paddle/nn/layer/pooling.py
index 68d5fa553b6d0fb6bc28b6cc22a3e0732a2bb424..3e47275410d09be16903d05c0be70b95edea32b1 100755
--- a/python/paddle/nn/layer/pooling.py
+++ b/python/paddle/nn/layer/pooling.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from ...fluid.layer_helper import LayerHelper
 from .. import functional as F
 from .. import Layer
 
diff --git a/python/paddle/nn/layer/rnn.py b/python/paddle/nn/layer/rnn.py
index f1b728d7bb2b0c01834ab7af98a42939f8844728..f4e70f2bd1688a77e4cae08bc6a9c51da9093617 100644
--- a/python/paddle/nn/layer/rnn.py
+++ b/python/paddle/nn/layer/rnn.py
@@ -12,26 +12,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import copy
-import collections
-import itertools
 import six
 import math
 import sys
-import warnings
-from functools import partial, reduce
+from functools import reduce
 
 import numpy as np
 import paddle
-import paddle.fluid as fluid
 from paddle import framework
-from paddle.device import get_device, get_cudnn_version
 from paddle.nn import functional as F
 from paddle.nn import initializer as I
 from paddle.nn import Layer, LayerList
 from paddle.fluid.layers import utils
-from paddle.fluid.layers.utils import map_structure, flatten, pack_sequence_as
-from paddle.fluid.data_feeder import convert_dtype
+from paddle.fluid.layers.utils import flatten, map_structure
 from paddle import _C_ops, _legacy_C_ops
 from paddle import in_dynamic_mode
 from paddle.fluid.framework import in_dygraph_mode
diff --git a/python/paddle/nn/quant/lsq.py b/python/paddle/nn/quant/lsq.py
index f92b3856dd39d66dcee30b35f45b08eed166561f..6ed6e78a6d98eee1413f449efae7dfc2d2007516 100644
--- a/python/paddle/nn/quant/lsq.py
+++ b/python/paddle/nn/quant/lsq.py
@@ -13,21 +13,12 @@
 # limitations under the License.
 
 import paddle
-from paddle.framework import core
-from paddle.fluid import dygraph_utils
 from paddle.utils import unique_name
 from paddle.framework import ParamAttr
-from paddle.fluid.framework import _varbase_creator
 from paddle.nn.initializer import Constant
-from paddle.fluid.data_feeder import check_variable_and_dtype
-from paddle.nn import functional as F
-import logging
-from paddle.fluid.log_helper import get_logger
-from paddle import in_dynamic_mode
 from paddle.nn import Layer
 from paddle.autograd import PyLayer
 import math
-import copy
 
 
 def round(x):
diff --git a/python/paddle/nn/quant/quant_layers.py b/python/paddle/nn/quant/quant_layers.py
index 855a05383775c82c6fb857609a1c41034dd959e2..affa180bd303a8fac804d8c845d7c7e798d0788f 100644
--- a/python/paddle/nn/quant/quant_layers.py
+++ b/python/paddle/nn/quant/quant_layers.py
@@ -14,7 +14,6 @@
 
 import paddle
 from paddle.framework import core
-from paddle.fluid import dygraph_utils
 from paddle.utils import unique_name
 from paddle.framework import ParamAttr
 from paddle.fluid.framework import _varbase_creator
@@ -23,7 +22,7 @@ from paddle.fluid.data_feeder import check_variable_and_dtype
 from paddle.nn import functional as F
 import logging
 from paddle.fluid.log_helper import get_logger
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 from paddle import in_dynamic_mode
 from paddle.nn import Layer
 from paddle.nn.quant.lsq import FakeQuantActLSQPlus, FakeQuantWeightLSQPlus
diff --git a/python/paddle/nn/utils/spectral_norm_hook.py b/python/paddle/nn/utils/spectral_norm_hook.py
index 4cde491a15fa8581965a3b0c2e5aed783326584f..a2a93d3241e3de4709dfcd91776d1188f93d6a16 100644
--- a/python/paddle/nn/utils/spectral_norm_hook.py
+++ b/python/paddle/nn/utils/spectral_norm_hook.py
@@ -12,9 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import math
-import numpy as np
-
 import paddle
 from ..layer.conv import Conv1DTranspose, Conv2DTranspose, Conv3DTranspose
 from ..layer.common import Linear
diff --git a/python/paddle/nn/utils/transform_parameters.py b/python/paddle/nn/utils/transform_parameters.py
index bc813ccad24e919f8b52200a8110e30a402c7d0b..63ddd0974446abc2a01f860699d6eb6f576b0f8e 100644
--- a/python/paddle/nn/utils/transform_parameters.py
+++ b/python/paddle/nn/utils/transform_parameters.py
@@ -16,7 +16,7 @@ from functools import reduce
 
 import paddle
 from paddle.fluid.framework import dygraph_only, _dygraph_tracer, _varbase_creator, in_dygraph_mode
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 
 
 #input==output, inplace strategy of reshape has no cost almostly
diff --git a/python/paddle/nn/utils/weight_norm_hook.py b/python/paddle/nn/utils/weight_norm_hook.py
index d2b0806712281fc12d9d2d58bcb708b274a2a822..b836ad2843907003ddca5f33297f7a765b3bb4b8 100755
--- a/python/paddle/nn/utils/weight_norm_hook.py
+++ b/python/paddle/nn/utils/weight_norm_hook.py
@@ -12,14 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import paddle
-import numpy as np
-from ... import fluid
-from ...fluid import dygraph
 from ...fluid import layers as F
 from ...fluid.layer_helper import LayerHelper
 from ...fluid.data_feeder import check_variable_and_dtype
 from ...framework import in_dygraph_mode
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 
 __all__ = []
 
diff --git a/python/paddle/reader/decorator.py b/python/paddle/reader/decorator.py
index 1104ba5a29b311344be48892f5d0b298f76a3703..0c41ae4909f0481a63dfd18503d30fd67cf8765b 100644
--- a/python/paddle/reader/decorator.py
+++ b/python/paddle/reader/decorator.py
@@ -13,7 +13,6 @@
 # limitations under the License.
 
 from threading import Thread
-import subprocess
 import multiprocessing
 import six
 import sys
@@ -26,9 +25,7 @@ from six.moves import map
 from six.moves import zip
 import itertools
 import random
-import zlib
 
-import paddle.compat as cpt
 from paddle.fluid.reader import QUEUE_GET_TIMEOUT
 
 __all__ = []
diff --git a/python/paddle/tensor/array.py b/python/paddle/tensor/array.py
index 02da6926a3f5f98b8cee209d291bcf096adf8c54..527cf692525ac0553af708c4aff145d92d4a12e4 100644
--- a/python/paddle/tensor/array.py
+++ b/python/paddle/tensor/array.py
@@ -14,7 +14,6 @@
 
 # Define functions about array.
 
-import paddle
 from ..static import Variable
 from ..framework import LayerHelper, core, _non_static_mode
 from ..fluid.data_feeder import check_type
diff --git a/python/paddle/tensor/attribute.py b/python/paddle/tensor/attribute.py
index ef5a3a229765e1528cb086840626a17a9a459b51..d68eebf1364b61ca0c49d48f31e79092348a09cd 100644
--- a/python/paddle/tensor/attribute.py
+++ b/python/paddle/tensor/attribute.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from ..framework import core, _non_static_mode
+from ..framework import core
 from ..framework import LayerHelper
 from ..fluid.data_feeder import check_variable_and_dtype
 from ..fluid.data_feeder import check_type
diff --git a/python/paddle/tensor/creation.py b/python/paddle/tensor/creation.py
index 834137c7501bd29c32172cf17ad1698954ab5ccd..675c186d47fc30c5118ef1301047d560802fc6c7 100644
--- a/python/paddle/tensor/creation.py
+++ b/python/paddle/tensor/creation.py
@@ -19,12 +19,11 @@ from paddle.common_ops_import import fill_constant
 from ..fluid.layers import utils
 from ..static import Variable, device_guard
 from ..framework import _current_expected_place, _get_paddle_place
-from ..framework import dygraph_only
 from ..framework import core
 from ..framework import in_dygraph_mode, _non_static_mode
 from ..framework import LayerHelper
 from ..fluid.data_feeder import check_variable_and_dtype, check_type, check_dtype, convert_dtype
-from ..framework import convert_np_dtype_to_dtype_, _varbase_creator, OpProtoHolder
+from ..framework import convert_np_dtype_to_dtype_
 # TODO: define functions to get create a tensor
 import paddle
 from paddle import _C_ops, _legacy_C_ops
diff --git a/python/paddle/tensor/einsum.py b/python/paddle/tensor/einsum.py
index a4a4b3f959b7c6886419a374de07dc1387656875..f8b014afb617af781629e33e7ae1bdbc1ae96775 100644
--- a/python/paddle/tensor/einsum.py
+++ b/python/paddle/tensor/einsum.py
@@ -16,15 +16,15 @@ import itertools
 import numpy as np
 import re
 
-from .linalg import dot, matmul, transpose
+from .linalg import matmul, transpose
 from .manipulation import squeeze, unsqueeze, reshape
 from .math import multiply
 from .math import sum as paddle_sum
 from ..fluid.framework import _in_legacy_dygraph
 from paddle import _C_ops, _legacy_C_ops
-from ..fluid.data_feeder import check_variable_and_dtype, check_type, check_dtype
+from ..fluid.data_feeder import check_type, check_variable_and_dtype
 from ..fluid.layer_helper import LayerHelper
-from ..fluid.framework import _non_static_mode, in_dygraph_mode, _in_legacy_dygraph
+from ..fluid.framework import _in_legacy_dygraph, in_dygraph_mode
 import collections
 import string
 import opt_einsum
diff --git a/python/paddle/tensor/layer_function_generator.py b/python/paddle/tensor/layer_function_generator.py
index 9acb4e87f333a4730e224dcfe809d9deb8b03ee3..a9a7bb6db6add36a68bea6eea2327cc941767cc9 100644
--- a/python/paddle/tensor/layer_function_generator.py
+++ b/python/paddle/tensor/layer_function_generator.py
@@ -13,17 +13,15 @@
 # limitations under the License.
 
 import re
-import functools
 import warnings
 import string
 
 from six.moves import cStringIO
 from ..static import Variable
 from ..fluid.proto import framework_pb2
-from ..framework import OpProtoHolder, core, convert_np_dtype_to_dtype_, _non_static_mode, in_dygraph_mode, _in_legacy_dygraph
+from ..framework import OpProtoHolder, _non_static_mode, convert_np_dtype_to_dtype_, core, in_dygraph_mode
 from ..framework import LayerHelper
 from ..fluid.data_feeder import check_variable_and_dtype
-import paddle
 from paddle import _C_ops, _legacy_C_ops
 
 __all__ = []
diff --git a/python/paddle/tensor/linalg.py b/python/paddle/tensor/linalg.py
index d8e55c1de99217e6231a452460c9a0e2113a4ef4..9d2844f51afa9d68a194bb1c90768b76d76da1e4 100644
--- a/python/paddle/tensor/linalg.py
+++ b/python/paddle/tensor/linalg.py
@@ -14,7 +14,7 @@
 
 import numpy as np
 from ..framework import LayerHelper
-from ..framework import _varbase_creator, _dygraph_tracer, in_dygraph_mode, _non_static_mode
+from ..framework import _non_static_mode, in_dygraph_mode
 from ..fluid.data_feeder import check_variable_and_dtype, check_type, check_dtype
 from ..static import Variable
 from ..fluid.framework import _in_legacy_dygraph
@@ -24,7 +24,6 @@ from .logic import logical_not
 from .creation import full
 
 import paddle
-import warnings
 from paddle.common_ops_import import VarDesc
 from paddle import _C_ops, _legacy_C_ops
 
diff --git a/python/paddle/tensor/logic.py b/python/paddle/tensor/logic.py
index 53649931ee6db666c35514d1caa99a948c722c61..6945ab3fd3f11d7ab5632f385544cc063d8f8334 100755
--- a/python/paddle/tensor/logic.py
+++ b/python/paddle/tensor/logic.py
@@ -23,7 +23,7 @@ if _in_eager_mode_:
 else:
     from ..framework import VarBase as Tensor
 
-from ..framework import in_dygraph_mode, _non_static_mode
+from ..framework import in_dygraph_mode
 from ..framework import LayerHelper
 from ..fluid.framework import _in_legacy_dygraph
 # TODO: define logic functions of a tensor
diff --git a/python/paddle/tensor/manipulation.py b/python/paddle/tensor/manipulation.py
index d5285351a29a14396c4135377072b8d0c2ab0ae7..540dd235e22549d7fd401b7c3fdf34dd77e1e12a 100644
--- a/python/paddle/tensor/manipulation.py
+++ b/python/paddle/tensor/manipulation.py
@@ -14,16 +14,15 @@
 
 from collections import Counter
 
-from ..static import Variable, device_guard
+from ..static import Variable
 from ..framework import core, in_dygraph_mode
-from ..fluid.framework import _in_legacy_dygraph, _in_eager_without_dygraph_check, _non_static_mode
+from ..fluid.framework import _in_legacy_dygraph, _non_static_mode
 from ..framework import LayerHelper
-from ..framework import OpProtoHolder, convert_np_dtype_to_dtype_, dygraph_only
+from ..framework import convert_np_dtype_to_dtype_, dygraph_only
 from ..fluid.data_feeder import convert_dtype, check_variable_and_dtype, check_type, check_dtype
 from ..fluid.layers import utils
 import numpy as np
 # TODO: define functions to manipulate a tensor
-from ..fluid.layers.nn import _elementwise_op_in_dygraph
 from ..fluid.dygraph.inplace_utils import inplace_apis_in_dygraph_only
 import paddle
 from paddle import _C_ops, _legacy_C_ops
diff --git a/python/paddle/tensor/math.py b/python/paddle/tensor/math.py
index 12099726028a6472478e0163abaf53eeeb153848..ffe426876ad1cae1832a379ba93259a4e36b4634 100644
--- a/python/paddle/tensor/math.py
+++ b/python/paddle/tensor/math.py
@@ -23,7 +23,7 @@ from paddle.common_ops_import import dygraph_utils
 
 from .manipulation import cast
 from .creation import _complex_to_real_dtype
-from .layer_function_generator import _generate_doc_string_, generate_activation_fn, generate_layer_fn
+from .layer_function_generator import generate_layer_fn
 
 import paddle
 from ..static import Variable
diff --git a/python/paddle/tensor/ops.py b/python/paddle/tensor/ops.py
index 35dee2823954cb5bca3bd9f17a1748dfce609c9a..46648f06d8205b765e32c6053d814828635b95c0 100644
--- a/python/paddle/tensor/ops.py
+++ b/python/paddle/tensor/ops.py
@@ -12,14 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 from .layer_function_generator import generate_layer_fn, generate_activation_fn, generate_inplace_fn, add_sample_code
-from ..framework import core
-from ..framework import convert_np_dtype_to_dtype_
-from ..static import Variable
-from ..fluid.data_feeder import convert_dtype, check_variable_and_dtype, check_type, check_dtype
 from ..fluid.framework import in_dygraph_mode
-from .. import _C_ops, _legacy_C_ops
+from .. import _C_ops
 
 __deprecated_func_name__ = {
     'tanh_shrink': 'tanhshrink',
diff --git a/python/paddle/tensor/search.py b/python/paddle/tensor/search.py
index 06813fbcf28f6d417b2dfb2a3c86086f00582fc0..0584ae8dcdd909411b7d79877c0e6fc0017feb80 100644
--- a/python/paddle/tensor/search.py
+++ b/python/paddle/tensor/search.py
@@ -14,14 +14,12 @@
 import numpy as np
 import paddle
 from ..framework import LayerHelper, convert_np_dtype_to_dtype_
-from ..fluid.data_feeder import check_variable_and_dtype, check_type, check_dtype
-from ..fluid import layers
+from ..fluid.data_feeder import check_dtype, check_variable_and_dtype
 from ..framework import core, in_dygraph_mode, _non_static_mode
 from ..fluid.framework import _in_legacy_dygraph
 from paddle.common_ops_import import Variable
 from paddle.common_ops_import import VarDesc
 from paddle import _C_ops, _legacy_C_ops
-from .logic import logical_not
 
 # TODO: define searching & indexing functions of a tensor
 # from ..fluid.layers import has_inf  #DEFINE_ALIAS
diff --git a/python/paddle/tensor/stat.py b/python/paddle/tensor/stat.py
index 3f4e23c2baf446a68762f7ce4e12466b2c4748b8..a22a2649719af6fc75df27a8bb16575e1b30cb99 100644
--- a/python/paddle/tensor/stat.py
+++ b/python/paddle/tensor/stat.py
@@ -14,13 +14,12 @@
 
 # TODO: define statistical functions of a tensor
 
-import numpy as np
 from ..static import Variable
 from ..framework import LayerHelper
 from ..framework import core
 from paddle.fluid.framework import _in_legacy_dygraph, in_dygraph_mode
 from .search import where
-from ..fluid.data_feeder import convert_dtype, check_variable_and_dtype, check_type, check_dtype
+from ..fluid.data_feeder import check_type, check_variable_and_dtype
 from ..fluid.layers import utils
 import paddle
 from paddle import _C_ops, _legacy_C_ops
diff --git a/python/paddle/tensor/to_string.py b/python/paddle/tensor/to_string.py
index 5dcaf785929849e23308b9090fd81110fa95c721..76f5c603f0f4b41e10f6db344153f0b47b817f82 100644
--- a/python/paddle/tensor/to_string.py
+++ b/python/paddle/tensor/to_string.py
@@ -12,10 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import numpy as np
 from ..framework import core
-from paddle.fluid.data_feeder import convert_dtype, check_variable_and_dtype, check_type, check_dtype
+from paddle.fluid.data_feeder import check_type, convert_dtype
 
 __all__ = []
 
diff --git a/python/paddle/tests/dist_hapi_mnist_dynamic.py b/python/paddle/tests/dist_hapi_mnist_dynamic.py
index 681fb086fbaaaa2d509fae8b1e9470673089d280..71c63eb62b4fe2387b2ae918524da6cfdf90d2f6 100644
--- a/python/paddle/tests/dist_hapi_mnist_dynamic.py
+++ b/python/paddle/tests/dist_hapi_mnist_dynamic.py
@@ -15,7 +15,6 @@
 import unittest
 
 import numpy as np
-import contextlib
 
 import paddle
 import paddle.fluid as fluid
diff --git a/python/paddle/tests/dist_hapi_mnist_static.py b/python/paddle/tests/dist_hapi_mnist_static.py
index 8977a5309689311d200a97ee3cce6257964df787..cc3b65725013c77dd75f2febcd9244276fcbfa67 100644
--- a/python/paddle/tests/dist_hapi_mnist_static.py
+++ b/python/paddle/tests/dist_hapi_mnist_static.py
@@ -15,7 +15,6 @@
 import unittest
 
 import numpy as np
-import contextlib
 
 import paddle
 import paddle.fluid as fluid
diff --git a/python/paddle/tests/hapi_mnist_bf16_static.py b/python/paddle/tests/hapi_mnist_bf16_static.py
index 2421e48d9a2f6b983eee9f02c5b8eac4eba40787..55db397be493be4ecde78cd2ac6f1dc0b752c6a1 100644
--- a/python/paddle/tests/hapi_mnist_bf16_static.py
+++ b/python/paddle/tests/hapi_mnist_bf16_static.py
@@ -22,7 +22,6 @@ from paddle.vision.datasets import MNIST
 from paddle.vision.models import LeNet
 import paddle.static.amp as amp
 import random
-from paddle import callbacks
 import argparse
 import ast
 
diff --git a/python/paddle/tests/hubconf.py b/python/paddle/tests/hubconf.py
index 8e0a5f297a381ea84161d8cbc1da41e4cb295fab..d730dcff51e244543fd08529f2eae5a5e007dca8 100644
--- a/python/paddle/tests/hubconf.py
+++ b/python/paddle/tests/hubconf.py
@@ -14,7 +14,6 @@
 
 dependencies = ['paddle']
 
-import paddle
 from test_hapi_hub_model import MM as _MM
 
 
diff --git a/python/paddle/tests/test_audio_functions.py b/python/paddle/tests/test_audio_functions.py
index cc5c83e76dc398bb88f728a6f95ebea2219a499e..200920e73123f2f24b170b1bcb947dfb251cbd2f 100644
--- a/python/paddle/tests/test_audio_functions.py
+++ b/python/paddle/tests/test_audio_functions.py
@@ -15,7 +15,6 @@ import unittest
 
 import librosa
 import numpy as np
-import os
 import paddle
 
 import paddle.audio
diff --git a/python/paddle/tests/test_audio_logmel_feature.py b/python/paddle/tests/test_audio_logmel_feature.py
index a89dc583c3d583109fff9ce905ffc044d0605016..413f4053c9c708ec7d4a9d1116382216b0e59006 100644
--- a/python/paddle/tests/test_audio_logmel_feature.py
+++ b/python/paddle/tests/test_audio_logmel_feature.py
@@ -15,12 +15,10 @@ import unittest
 
 import librosa
 import numpy as np
-import os
 import paddle
 
 import paddle.audio
 import scipy
-from scipy import signal
 import itertools
 from parameterized import parameterized
 
diff --git a/python/paddle/tests/test_audio_mel_feature.py b/python/paddle/tests/test_audio_mel_feature.py
index 427e9864117cd3c90c806681ad17060cad16a3a5..7ddfc9ac4872163c85641f69fb40726b47bfdefe 100644
--- a/python/paddle/tests/test_audio_mel_feature.py
+++ b/python/paddle/tests/test_audio_mel_feature.py
@@ -15,11 +15,9 @@ import unittest
 
 import librosa
 import numpy as np
-import os
 import paddle
 
 import paddle.audio
-from scipy import signal
 import itertools
 from parameterized import parameterized
 
diff --git a/python/paddle/tests/test_callback_early_stop.py b/python/paddle/tests/test_callback_early_stop.py
index 03741d98820ec99a52ec2ac72a8c3cb2ed2dbb56..79a6265420148309fd1cbdef0dee768992851be4 100644
--- a/python/paddle/tests/test_callback_early_stop.py
+++ b/python/paddle/tests/test_callback_early_stop.py
@@ -13,8 +13,6 @@
 # limitations under the License.
 
 import unittest
-import time
-import random
 import tempfile
 import shutil
 import numpy as np
@@ -23,7 +21,6 @@ import paddle
 from paddle import Model
 from paddle.static import InputSpec
 from paddle.vision.models import LeNet
-from paddle.hapi.callbacks import config_callbacks
 from paddle.vision.datasets import MNIST
 from paddle.metric import Accuracy
 from paddle.nn.layer.loss import CrossEntropyLoss
diff --git a/python/paddle/tests/test_callback_reduce_lr_on_plateau.py b/python/paddle/tests/test_callback_reduce_lr_on_plateau.py
index e841a3f2fa57d860b510fd448433332c8487a4c6..02ac3245b7f87cd82504439b59a08df5639880b9 100644
--- a/python/paddle/tests/test_callback_reduce_lr_on_plateau.py
+++ b/python/paddle/tests/test_callback_reduce_lr_on_plateau.py
@@ -12,24 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys
 import unittest
-import time
-import random
-import tempfile
-import shutil
-import numpy as np
 
 import paddle
 import paddle.vision.transforms as T
 from paddle import Model
 from paddle.static import InputSpec
 from paddle.vision.models import LeNet
-from paddle.hapi.callbacks import config_callbacks
 from paddle.vision.datasets import MNIST
 from paddle.metric import Accuracy
 from paddle.nn.layer.loss import CrossEntropyLoss
-from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph
+from paddle.fluid.framework import _test_eager_guard
 
 
 # Accelerate unittest
diff --git a/python/paddle/tests/test_callback_visualdl.py b/python/paddle/tests/test_callback_visualdl.py
index 6ea6e61f4eb77c63d589c59eeefb559494155090..0cca89fa7cd3b59c80a9778fe20b36c6b528cf18 100644
--- a/python/paddle/tests/test_callback_visualdl.py
+++ b/python/paddle/tests/test_callback_visualdl.py
@@ -14,22 +14,14 @@
 
 import sys
 import unittest
-import time
-import random
 import tempfile
 import shutil
-import numpy as np
 
 import paddle
-from paddle import Model
 from paddle.static import InputSpec
-from paddle.vision.models import LeNet
-from paddle.hapi.callbacks import config_callbacks
 import paddle.vision.transforms as T
 from paddle.vision.datasets import MNIST
-from paddle.metric import Accuracy
-from paddle.nn.layer.loss import CrossEntropyLoss
-from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph
+from paddle.fluid.framework import _test_eager_guard
 
 
 class MnistDataset(MNIST):
diff --git a/python/paddle/tests/test_callbacks.py b/python/paddle/tests/test_callbacks.py
index b0b23b0efa382f0995bd4a930867b3d20e23cc9f..cc43f82c5c279e9a7ca61b4709e8a5221fab3fa1 100644
--- a/python/paddle/tests/test_callbacks.py
+++ b/python/paddle/tests/test_callbacks.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys
 import unittest
 import time
 import random
@@ -20,15 +19,11 @@ import tempfile
 import shutil
 import numpy as np
 
-import paddle
 from paddle import Model
 from paddle.static import InputSpec
 from paddle.vision.models import LeNet
 from paddle.hapi.callbacks import config_callbacks
-import paddle.vision.transforms as T
 from paddle.vision.datasets import MNIST
-from paddle.metric import Accuracy
-from paddle.nn.layer.loss import CrossEntropyLoss
 
 
 class MnistDataset(MNIST):
diff --git a/python/paddle/tests/test_dataset_uci_housing.py b/python/paddle/tests/test_dataset_uci_housing.py
index beff1f71fe6c467c4f240f6ba0e367d91f2e960f..563dd62efa3b62572d59a95c3d772caf33fc099d 100644
--- a/python/paddle/tests/test_dataset_uci_housing.py
+++ b/python/paddle/tests/test_dataset_uci_housing.py
@@ -13,11 +13,7 @@
 # limitations under the License.
 
 import unittest
-import os
 import numpy as np
-import tempfile
-import shutil
-import cv2
 
 from paddle.text.datasets import UCIHousing, WMT14
 
diff --git a/python/paddle/tests/test_dataset_voc.py b/python/paddle/tests/test_dataset_voc.py
index f52abab2ca643de8997c322c099401ec769e2496..4d67ba9c10a5415f28dcd4f88364d98838847822 100644
--- a/python/paddle/tests/test_dataset_voc.py
+++ b/python/paddle/tests/test_dataset_voc.py
@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import unittest
-import os
 import numpy as np
 
 from paddle.vision.datasets import voc2012, VOC2012
diff --git a/python/paddle/tests/test_datasets.py b/python/paddle/tests/test_datasets.py
index ae55377dfdf266241425b8ed6e7f2dea341941d3..0f6396ec051491bf3fe54a37fa3a17699cb7554f 100644
--- a/python/paddle/tests/test_datasets.py
+++ b/python/paddle/tests/test_datasets.py
@@ -22,7 +22,7 @@ import cv2
 import paddle.vision.transforms as T
 from paddle.vision.datasets import DatasetFolder, ImageFolder, MNIST, FashionMNIST, Flowers
 from paddle.dataset.common import _check_exists_and_download
-from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph
+from paddle.fluid.framework import _test_eager_guard
 
 
 class TestFolderDatasets(unittest.TestCase):
diff --git a/python/paddle/tests/test_dlpack.py b/python/paddle/tests/test_dlpack.py
index 353dc7ebfef11216bcd19c66cac8ff2d23a1c52f..256ca41ffff2d5383366902026d0dcfb030d1de2 100644
--- a/python/paddle/tests/test_dlpack.py
+++ b/python/paddle/tests/test_dlpack.py
@@ -18,7 +18,7 @@ import numpy as np
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.framework import _test_eager_guard, in_dygraph_mode
+from paddle.fluid.framework import _test_eager_guard
 
 
 class TestDLPack(unittest.TestCase):
diff --git a/python/paddle/tests/test_hapi_hub_model.py b/python/paddle/tests/test_hapi_hub_model.py
index e058a6e39aaf3ae98dd7d937ad1dd937aff0dd45..6170409fbe084c30f618c25ebc413752d33711cd 100644
--- a/python/paddle/tests/test_hapi_hub_model.py
+++ b/python/paddle/tests/test_hapi_hub_model.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import paddle.nn as nn
 import paddle.nn.functional as F
 
diff --git a/python/paddle/tests/test_logger.py b/python/paddle/tests/test_logger.py
index 6d9aba6717dcdf2cd4c0346e8959b5ca647f2673..4566a7ff693fb614ed7c662e9266ca45c8326826 100644
--- a/python/paddle/tests/test_logger.py
+++ b/python/paddle/tests/test_logger.py
@@ -14,7 +14,6 @@
 
 import unittest
 import os
-import numpy as np
 import shutil
 import tempfile
 
diff --git a/python/paddle/tests/test_metrics.py b/python/paddle/tests/test_metrics.py
index ec9f56cff4ec9d6f55d0a775352787a61ed3c836..61b20251e048603f8a7449603247ad116588b78e 100644
--- a/python/paddle/tests/test_metrics.py
+++ b/python/paddle/tests/test_metrics.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import unittest
 import numpy as np
 
diff --git a/python/paddle/tests/test_model.py b/python/paddle/tests/test_model.py
index 0e4c24a27376a5c845c4a3a7464160ea92975d1d..5bb47b0ddfb32b7040d4a26a3f6e4bed93396090 100644
--- a/python/paddle/tests/test_model.py
+++ b/python/paddle/tests/test_model.py
@@ -22,7 +22,7 @@ import tempfile
 import paddle
 from paddle import fluid
 from paddle import to_tensor
-from paddle.nn import Conv2D, Linear, ReLU, Sequential, Softmax
+from paddle.nn import Conv2D, Linear, ReLU, Sequential
 
 from paddle import Model
 from paddle.static import InputSpec
@@ -34,7 +34,6 @@ import paddle.vision.models as models
 import paddle.fluid.dygraph.jit as jit
 from paddle.io import DistributedBatchSampler, Dataset
 from paddle.hapi.model import prepare_distributed_context
-from paddle.fluid.dygraph.jit import declarative
 from paddle.fluid.dygraph.dygraph_to_static.program_translator import ProgramTranslator
 
 
diff --git a/python/paddle/tests/test_read_file.py b/python/paddle/tests/test_read_file.py
index dc5c8fafcd8f62853f555a72266833fd7a5b50e8..ce387f039c7e688aa46f4d7a1b6461814cf89f82 100644
--- a/python/paddle/tests/test_read_file.py
+++ b/python/paddle/tests/test_read_file.py
@@ -14,7 +14,6 @@
 
 import os
 import cv2
-import shutil
 import unittest
 import tempfile
 import numpy as np
diff --git a/python/paddle/tests/test_transforms.py b/python/paddle/tests/test_transforms.py
index c46ab2eaf5f57d8a2b9ba78265692d53a6faebaf..f182cbd799c189923395e1db8429564e5e5e4799 100644
--- a/python/paddle/tests/test_transforms.py
+++ b/python/paddle/tests/test_transforms.py
@@ -21,7 +21,7 @@ import numpy as np
 from PIL import Image
 
 import paddle
-from paddle.vision import get_image_backend, set_image_backend, image_load
+from paddle.vision import image_load, set_image_backend
 from paddle.vision.datasets import DatasetFolder
 from paddle.vision.transforms import transforms
 import paddle.vision.transforms.functional as F
diff --git a/python/paddle/utils/cpp_extension/cpp_extension.py b/python/paddle/utils/cpp_extension/cpp_extension.py
index 2a9cefa0b9e88c2e2ffd28a400385c8ecf2a5c75..4ac8949d4753ce2d4ce9d85e80c9481dc0d94352 100644
--- a/python/paddle/utils/cpp_extension/cpp_extension.py
+++ b/python/paddle/utils/cpp_extension/cpp_extension.py
@@ -22,11 +22,11 @@ from setuptools.command.easy_install import easy_install
 from setuptools.command.build_ext import build_ext
 from distutils.command.build import build
 
-from .extension_utils import find_cuda_home, find_rocm_home, normalize_extension_kwargs, add_compile_flag, run_cmd
+from .extension_utils import add_compile_flag, find_cuda_home, find_rocm_home, normalize_extension_kwargs
 from .extension_utils import is_cuda_file, prepare_unix_cudaflags, prepare_win_cudaflags
 from .extension_utils import _import_module_from_library, _write_setup_file, _jit_compile
 from .extension_utils import check_abi_compatibility, log_v, CustomOpInfo, parse_op_name_from
-from .extension_utils import clean_object_if_change_cflags, _reset_so_rpath, _get_fluid_path
+from .extension_utils import _reset_so_rpath, clean_object_if_change_cflags
 from .extension_utils import bootstrap_context, get_build_directory, add_std_without_repeat
 
 from .extension_utils import IS_WINDOWS, OS_NAME, MSVC_COMPILE_FLAGS, MSVC_COMPILE_FLAGS
diff --git a/python/paddle/utils/cpp_extension/extension_utils.py b/python/paddle/utils/cpp_extension/extension_utils.py
index 4d9b14fad151bbfeabd8c1e098d29848e77ce3b9..8b07abe7c8501062269c9b265b4ff047acbfafe7 100644
--- a/python/paddle/utils/cpp_extension/extension_utils.py
+++ b/python/paddle/utils/cpp_extension/extension_utils.py
@@ -397,7 +397,6 @@ def _get_core_name():
     """
     Return pybind DSO module name.
     """
-    import paddle
     ext_name = '.pyd' if IS_WINDOWS else '.so'
     return 'libpaddle' + ext_name
 
diff --git a/python/paddle/utils/dlpack.py b/python/paddle/utils/dlpack.py
index 43c9e6b1787b2aac6afb07870c0396a7d023fedb..bc05cd9c29964c8fd0d6e70f7bd56aad28346cb1 100644
--- a/python/paddle/utils/dlpack.py
+++ b/python/paddle/utils/dlpack.py
@@ -15,7 +15,7 @@
 import paddle
 from ..fluid.core import LoDTensor
 from ..fluid.framework import _non_static_mode
-from ..fluid.data_feeder import check_type, check_dtype, convert_dtype
+from ..fluid.data_feeder import check_type
 
 __all__ = [
     'to_dlpack',
diff --git a/python/paddle/utils/download.py b/python/paddle/utils/download.py
index be487665f1ce4b92eb9c6ec53f28b48131dc094a..270ad51c66f6d2fb4e1c206369583b4aa6b1a319 100644
--- a/python/paddle/utils/download.py
+++ b/python/paddle/utils/download.py
@@ -22,7 +22,6 @@ import hashlib
 import tarfile
 import zipfile
 import time
-from collections import OrderedDict
 
 try:
     from tqdm import tqdm
diff --git a/python/paddle/utils/install_check.py b/python/paddle/utils/install_check.py
index 4d05aea21aa750209d3ea49a6a01b40c7391ae5e..f8fd9d71df58e52b985d2dc027e0ba058ac96fa5 100644
--- a/python/paddle/utils/install_check.py
+++ b/python/paddle/utils/install_check.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import logging
 import numpy as np