diff --git a/python/paddle/fluid/tests/unittests/fft/spectral_op_np.py b/python/paddle/fluid/tests/unittests/fft/spectral_op_np.py
index 756dd7889977b4f6a243d541ae8b76486ea41cf8..0dc958f54fcf10eeda5fab9d84c533184512d5eb 100644
--- a/python/paddle/fluid/tests/unittests/fft/spectral_op_np.py
+++ b/python/paddle/fluid/tests/unittests/fft/spectral_op_np.py
@@ -16,7 +16,7 @@ import enum
 import numpy as np
 from functools import partial
 from numpy import asarray
-from numpy.fft._pocketfft import _raw_fft, _raw_fftnd, _get_forward_norm, _get_backward_norm, _cook_nd_args
+from numpy.fft._pocketfft import _cook_nd_args, _raw_fft, _raw_fftnd
 
 
 class NormMode(enum.Enum):
diff --git a/python/paddle/fluid/tests/unittests/fft/test_fft.py b/python/paddle/fluid/tests/unittests/fft/test_fft.py
index 7ae48819de3d9f8c97d0954f366d626d42484b7b..e6ea9865ae3c313f90e7121a9ffd2eb1406af516 100644
--- a/python/paddle/fluid/tests/unittests/fft/test_fft.py
+++ b/python/paddle/fluid/tests/unittests/fft/test_fft.py
@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import contextlib
-import re
 import sys
 import unittest
 
diff --git a/python/paddle/fluid/tests/unittests/fft/test_fft_with_static_graph.py b/python/paddle/fluid/tests/unittests/fft/test_fft_with_static_graph.py
index 2c0ff3f9272ebb7f2b76ddc2ae7de256be03c49d..7b286c5086c7352a9a8863e9125d80b627625a58 100644
--- a/python/paddle/fluid/tests/unittests/fft/test_fft_with_static_graph.py
+++ b/python/paddle/fluid/tests/unittests/fft/test_fft_with_static_graph.py
@@ -13,8 +13,6 @@
 # limitations under the License.
 
 import contextlib
-import re
-import sys
 import unittest
 
 import numpy as np
diff --git a/python/paddle/fluid/tests/unittests/fft/test_spectral_op.py b/python/paddle/fluid/tests/unittests/fft/test_spectral_op.py
index 16dd37cf815a3f7ba9a1d5178d6d5f1dd4aff40c..bc362d1b7a64368ee18fe873b5552d3f65721f4c 100644
--- a/python/paddle/fluid/tests/unittests/fft/test_spectral_op.py
+++ b/python/paddle/fluid/tests/unittests/fft/test_spectral_op.py
@@ -12,20 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
-
 import numpy as np
 import paddle
 
 import re
 import sys
 from spectral_op_np import fft_c2c, fft_r2c, fft_c2r, fft_c2c_backward, fft_r2c_backward, fft_c2r_backward
-import paddle.fluid.core as core
-import paddle.fluid.dygraph as dg
-import paddle.static as static
-from numpy.random import random as rand
-from paddle.fluid import Program, program_guard
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 
 sys.path.append("../")
 from op_test import OpTest
diff --git a/python/paddle/fluid/tests/unittests/ps/fl_ps_trainer.py b/python/paddle/fluid/tests/unittests/ps/fl_ps_trainer.py
index 76c5109e9b9cf6d2e917fae5f6381d34cb508436..aebf38a458538d2cbb503a8494a6eefcda023e2c 100755
--- a/python/paddle/fluid/tests/unittests/ps/fl_ps_trainer.py
+++ b/python/paddle/fluid/tests/unittests/ps/fl_ps_trainer.py
@@ -13,11 +13,8 @@
 # limitations under the License.
 
 import os
-import unittest
-import numpy as np
 import time
 import paddle
-from paddle.distributed.ps.utils.public import ps_log_root_dir, debug_program
 import paddle.distributed.fleet as fleet
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/ps/ps_dnn_trainer.py b/python/paddle/fluid/tests/unittests/ps/ps_dnn_trainer.py
index 3cad88ec6bc447093ec2c6d9643f1fdbb7081a13..d54f86b38633828abeb6a3df55c245335781c0ca 100755
--- a/python/paddle/fluid/tests/unittests/ps/ps_dnn_trainer.py
+++ b/python/paddle/fluid/tests/unittests/ps/ps_dnn_trainer.py
@@ -16,12 +16,10 @@ import paddle.distributed.fleet.base.role_maker as role_maker
 from paddle.distributed.ps.utils.ps_program_builder import *
 import paddle.distributed.fleet as fleet
 import argparse
-import time
 import sys
 import yaml, six, copy
 import paddle
 import os
-import warnings
 import ast
 import numpy as np
 import struct
diff --git a/python/paddle/fluid/tests/unittests/ps/test_fl_ps.py b/python/paddle/fluid/tests/unittests/ps/test_fl_ps.py
index c2fc55efdfeb40a3f83363948465caacfaf8236d..0a993217ebad2fdf5adc5365b9ec553cac38b520 100755
--- a/python/paddle/fluid/tests/unittests/ps/test_fl_ps.py
+++ b/python/paddle/fluid/tests/unittests/ps/test_fl_ps.py
@@ -15,15 +15,14 @@
 # limitations under the License.
 
 import unittest
-import shlex
-from paddle.fluid.tests.unittests.distributed_passes.dist_pass_test_base import prepare_python_path_and_return_module, remove_path_if_exists
+import shlex  # noqa: F401
+from paddle.fluid.tests.unittests.distributed_passes.dist_pass_test_base import remove_path_if_exists  # noqa: F401
 import os
 
 
 class FlPsTest(unittest.TestCase):
 
     def test_launch_fl_ps(self):
-        pass
         '''
         cmd = [
             'python', '-m', 'paddle.distributed.fleet.launch', '--log_dir',
@@ -36,6 +35,7 @@ class FlPsTest(unittest.TestCase):
         prepare_python_path_and_return_module(__file__)
         exitcode = os.system(' '.join(cmd))
         '''
+        pass
 
 
 if __name__ == '__main__':
diff --git a/python/paddle/fluid/tests/unittests/ps/test_the_one_ps.py b/python/paddle/fluid/tests/unittests/ps/test_the_one_ps.py
index 7dfaef29f38675daf4b161f8aff0062232d94b70..c0d10d63687f4749ac8e9e0d33f43306a408d722 100755
--- a/python/paddle/fluid/tests/unittests/ps/test_the_one_ps.py
+++ b/python/paddle/fluid/tests/unittests/ps/test_the_one_ps.py
@@ -12,19 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import unittest
-import numpy as np
 
-import paddle
-import paddle.fluid as fluid
-
-import paddle
 from paddle.fluid.tests.unittests.distributed_passes.ps_pass_test_base import *
 from paddle.distributed.ps.utils.public import logger, ps_log_root_dir
-from ps_dnn_trainer import DnnTrainer
-import paddle.distributed.fleet.proto.the_one_ps_pb2 as ps_pb2
-from google.protobuf import text_format
+import paddle.distributed.fleet.proto.the_one_ps_pb2 as ps_pb2  # noqa: F401
+from google.protobuf import text_format  # noqa: F401
 
 
 class TestTheOnePs(PsPassTestBase):
@@ -36,7 +29,6 @@ class TestTheOnePs(PsPassTestBase):
         pass
 
     def check(self, file1, file2):
-        pass
         '''
         f = open(file1, "rb")
         ps_desc_1 = ps_pb2.PSParameter()
@@ -56,6 +48,7 @@ class TestTheOnePs(PsPassTestBase):
         else:
             return False
         '''
+        pass
 
     def test_ps_cpu_async(self):
         self.init()
diff --git a/python/paddle/fluid/tests/unittests/rnn/convert.py b/python/paddle/fluid/tests/unittests/rnn/convert.py
index 1a3e571269d66cd93752593eb7201aeabe516467..b26db11e1d34ff107286c18921ea872bb71c9505 100644
--- a/python/paddle/fluid/tests/unittests/rnn/convert.py
+++ b/python/paddle/fluid/tests/unittests/rnn/convert.py
@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import paddle
-import numpy as np
 
 
 def convert_params_for_cell(np_cell, paddle_cell):