diff --git a/python/paddle/fluid/tests/unittests/ascend_group.py b/python/paddle/fluid/tests/unittests/ascend_group.py
index 1d3f308a61117f091be73d7d88d3b4175b55a125..32b42a00fc657104d95c421432827454ee925ae0 100644
--- a/python/paddle/fluid/tests/unittests/ascend_group.py
+++ b/python/paddle/fluid/tests/unittests/ascend_group.py
@@ -13,15 +13,13 @@
 # limitations under the License.
 
 import os
-import sys
-import time
 import paddle.fluid as fluid
 from paddle.fluid import unique_name
 import paddle.fluid.core as core
 import paddle
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.distributed import fleet
-from paddle.distributed.fleet.meta_optimizers.ascend import ascend_parser, ascend_optimizer
+from paddle.distributed.fleet.meta_optimizers.ascend import ascend_optimizer
 from collections import namedtuple
 
 Block = namedtuple('Block', ['program'])
diff --git a/python/paddle/fluid/tests/unittests/ascend_multi_process_collective.py b/python/paddle/fluid/tests/unittests/ascend_multi_process_collective.py
index bb2180a733f818f81963e9702c854a78488a7592..1853e529d51dc0ad3e055fd62792506cf56d932d 100644
--- a/python/paddle/fluid/tests/unittests/ascend_multi_process_collective.py
+++ b/python/paddle/fluid/tests/unittests/ascend_multi_process_collective.py
@@ -14,7 +14,6 @@
 
 import os
 import sys
-import time
 
 
 def train(prefix):
diff --git a/python/paddle/fluid/tests/unittests/auto_checkpoint_utils.py b/python/paddle/fluid/tests/unittests/auto_checkpoint_utils.py
index 47db2793dc08f6ec4bb14b481e28547f90f6274e..4303c56675b21396f63d026cb41c396785403df9 100644
--- a/python/paddle/fluid/tests/unittests/auto_checkpoint_utils.py
+++ b/python/paddle/fluid/tests/unittests/auto_checkpoint_utils.py
@@ -13,21 +13,14 @@
 # limitations under the License.
 
 import unittest
-import paddle
 import paddle.fluid as fluid
-import paddle.fluid.incubate.fleet.base.role_maker as role_maker
-from paddle.fluid.incubate.fleet.collective import CollectiveOptimizer, fleet
 import os
-import sys
 
-from paddle.distributed.fleet.utils.fs import LocalFS, HDFSClient
 import paddle.fluid.incubate.checkpoint.auto_checkpoint as acp
-from paddle.fluid.incubate.checkpoint.checkpoint_saver import PaddleModel
 from paddle.fluid.framework import program_guard
 from paddle.fluid import unique_name
 
 import numpy as np
-from paddle.io import Dataset, BatchSampler, DataLoader
 
 BATCH_NUM = 4
 BATCH_SIZE = 1
diff --git a/python/paddle/fluid/tests/unittests/auto_parallel_autoconvert.py b/python/paddle/fluid/tests/unittests/auto_parallel_autoconvert.py
index f730f83c961757fce32a3dffd50768e27a89dc23..b8c64c0af5454b3138831cea35e3430a5982c931 100644
--- a/python/paddle/fluid/tests/unittests/auto_parallel_autoconvert.py
+++ b/python/paddle/fluid/tests/unittests/auto_parallel_autoconvert.py
@@ -16,7 +16,6 @@ import unittest
 import random
 import numpy as np
 import os
-import shutil
 
 import paddle
 import paddle.nn as nn
diff --git a/python/paddle/fluid/tests/unittests/auto_parallel_data_unshard.py b/python/paddle/fluid/tests/unittests/auto_parallel_data_unshard.py
index 04af950e8114d43637d3a490b91aefd3c5124b0c..e08739039c8acad934c0ca933b43b6022bc862db 100644
--- a/python/paddle/fluid/tests/unittests/auto_parallel_data_unshard.py
+++ b/python/paddle/fluid/tests/unittests/auto_parallel_data_unshard.py
@@ -14,13 +14,11 @@
 
 import unittest
 
-import copy
 import numpy as np
 import random
 
 import paddle
 import paddle.nn as nn
-import paddle.fluid.core as core
 from paddle.distributed.fleet import auto
 import paddle.nn.functional as F
 from paddle.distributed import fleet
diff --git a/python/paddle/fluid/tests/unittests/auto_parallel_gpt_model.py b/python/paddle/fluid/tests/unittests/auto_parallel_gpt_model.py
index b8bbe582cbecccedd8e5a905e95a1b66a486a0d6..027f4a8e0d766f63e4f729385ae8e56dfd97671f 100644
--- a/python/paddle/fluid/tests/unittests/auto_parallel_gpt_model.py
+++ b/python/paddle/fluid/tests/unittests/auto_parallel_gpt_model.py
@@ -13,19 +13,14 @@
 # limitations under the License.
 
 import collections
-import random
-import numpy as np
 
 import paddle
 import paddle.nn as nn
 import paddle.nn.functional as F
 import paddle.tensor as tensor
 from paddle.distributed.fleet import auto
-from paddle import fluid
 from paddle.fluid import layers
-from paddle.distributed import fleet
 from paddle.nn.layer.transformer import _convert_param_attr_to_list
-from paddle.fluid.initializer import Normal, NumpyArrayInitializer
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/benchmark.py b/python/paddle/fluid/tests/unittests/benchmark.py
index 11f815333f3e1800a6a9c44b29b4c297f6da4a69..9e6278dd32f88e46284606e832df4188f7c86343 100644
--- a/python/paddle/fluid/tests/unittests/benchmark.py
+++ b/python/paddle/fluid/tests/unittests/benchmark.py
@@ -13,13 +13,9 @@
 # limitations under the License.
 
 import numpy as np
-import unittest
 import time
-import itertools
 import six
 
-import paddle.fluid as fluid
-import paddle.fluid.core as core
 from paddle.fluid.op import Operator
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/benchmark_sum_op.py b/python/paddle/fluid/tests/unittests/benchmark_sum_op.py
index 3f2e597b0d6f7b6818aa039f7521045a657d5614..d3d909e17e49d9d8c2125fbcd432722a14397750 100644
--- a/python/paddle/fluid/tests/unittests/benchmark_sum_op.py
+++ b/python/paddle/fluid/tests/unittests/benchmark_sum_op.py
@@ -15,9 +15,7 @@
 import unittest
 import numpy as np
 
-import paddle.fluid as fluid
 from benchmark import BenchmarkSuite
-from op_test import OpTest
 
 # This is a demo op test case for operator benchmarking and high resolution number stability alignment.
 
diff --git a/python/paddle/fluid/tests/unittests/c_embedding_op_base.py b/python/paddle/fluid/tests/unittests/c_embedding_op_base.py
index e7e93ac1b7947bccf7ea6def61005bff9453eba4..ef3c942d2b09681d66ae25cce84cdf7f1bde1a3e 100644
--- a/python/paddle/fluid/tests/unittests/c_embedding_op_base.py
+++ b/python/paddle/fluid/tests/unittests/c_embedding_op_base.py
@@ -15,8 +15,6 @@
 import unittest
 import numpy as np
 from op_test import OpTest
-import paddle
-import paddle.fluid as fluid
 from paddle.framework import core
 
 SEED = 2021
diff --git a/python/paddle/fluid/tests/unittests/check_nan_inf_base.py b/python/paddle/fluid/tests/unittests/check_nan_inf_base.py
index 025772783c5cda2a8e49d250a28a85e2c77c08c3..1c4bfd387c42c17987ea1f542b05b6d98ec3e20d 100644
--- a/python/paddle/fluid/tests/unittests/check_nan_inf_base.py
+++ b/python/paddle/fluid/tests/unittests/check_nan_inf_base.py
@@ -13,8 +13,6 @@
 # limitations under the License.
 
 import os
-import sys
-import time
 import numpy as np
 
 os.environ[str("FLAGS_check_nan_inf")] = str("1")
@@ -23,7 +21,6 @@ os.environ[str("GLOG_vmodule")] = str("nan_inf_utils_detail=10")
 import paddle.fluid.core as core
 import paddle
 import paddle.fluid as fluid
-import paddle.compat as cpt
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/check_nan_inf_base_dygraph.py b/python/paddle/fluid/tests/unittests/check_nan_inf_base_dygraph.py
index 83cca20cda443c6c0f701574c80a39e024bbbfc0..9622ee4e9a92e1f0b06b07f9355cd4de77c26218 100644
--- a/python/paddle/fluid/tests/unittests/check_nan_inf_base_dygraph.py
+++ b/python/paddle/fluid/tests/unittests/check_nan_inf_base_dygraph.py
@@ -13,8 +13,6 @@
 # limitations under the License.
 
 import os
-import sys
-import time
 import numpy as np
 
 os.environ[str("FLAGS_check_nan_inf")] = str("1")
diff --git a/python/paddle/fluid/tests/unittests/collective/communication_stream_allgather_api_dygraph.py b/python/paddle/fluid/tests/unittests/collective/communication_stream_allgather_api_dygraph.py
index d0e46600b8b50f3b43b149ac0b851121ecc4fa74..f4ff1e5b7b37cc8bf9e94a636f8d9c8be40f5cf7 100644
--- a/python/paddle/fluid/tests/unittests/collective/communication_stream_allgather_api_dygraph.py
+++ b/python/paddle/fluid/tests/unittests/collective/communication_stream_allgather_api_dygraph.py
@@ -15,9 +15,7 @@
 import os
 import numpy as np
 import paddle
-import paddle.fluid as fluid
 import paddle.distributed as dist
-import test_communication_api_base as test_base
 import test_collective_api_base as test_collective_base
 
 
diff --git a/python/paddle/fluid/tests/unittests/collective/test_communication_stream_allgather_api.py b/python/paddle/fluid/tests/unittests/collective/test_communication_stream_allgather_api.py
index 254b64907ce07facc79f42906d5109f0a26b2f95..306248a03354249f17ddf4624861e62c4c52dc17 100644
--- a/python/paddle/fluid/tests/unittests/collective/test_communication_stream_allgather_api.py
+++ b/python/paddle/fluid/tests/unittests/collective/test_communication_stream_allgather_api.py
@@ -13,8 +13,6 @@
 # limitations under the License.
 
 import unittest
-import paddle
-import itertools
 import test_communication_api_base as test_base
 
 
diff --git a/python/paddle/fluid/tests/unittests/collective_allgather_op.py b/python/paddle/fluid/tests/unittests/collective_allgather_op.py
index d8e749ff93be68f18d3d44e17d2922ed215902b2..e897e1638852fc78dcb02b190b65d08a1376c258 100644
--- a/python/paddle/fluid/tests/unittests/collective_allgather_op.py
+++ b/python/paddle/fluid/tests/unittests/collective_allgather_op.py
@@ -12,24 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import os
-import sys
-import signal
-import time
-from contextlib import closing
-from six import string_types
-import math
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-import paddle.fluid.unique_name as nameGen
 from paddle.fluid import core
-import unittest
-from multiprocessing import Process
 import paddle.fluid.layers as layers
-from functools import reduce
 from test_collective_base import TestCollectiveRunnerBase, runtime_main
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/collective_reducescatter.py b/python/paddle/fluid/tests/unittests/collective_reducescatter.py
index c2cf7f8c26792d64583f3959c6047f85d866c5a0..480f9aeb3805fd55d03d0884b3495d9857093d72 100644
--- a/python/paddle/fluid/tests/unittests/collective_reducescatter.py
+++ b/python/paddle/fluid/tests/unittests/collective_reducescatter.py
@@ -12,24 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import os
-import sys
-import signal
-import time
-from contextlib import closing
-from six import string_types
-import math
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-import paddle.fluid.unique_name as nameGen
-from paddle.fluid import core
-import unittest
-from multiprocessing import Process
 import paddle.fluid.layers as layers
-from functools import reduce
 from test_collective_base import TestCollectiveRunnerBase, runtime_main
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/collective_reducescatter_op.py b/python/paddle/fluid/tests/unittests/collective_reducescatter_op.py
index e3c01c1bcfec6b9ff9ba5506cd4585bc9f2b4bed..042817f8c3f2ca66cc4c7ff97a465dacec293de6 100644
--- a/python/paddle/fluid/tests/unittests/collective_reducescatter_op.py
+++ b/python/paddle/fluid/tests/unittests/collective_reducescatter_op.py
@@ -12,25 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import os
-import sys
-import signal
-import time
-import socket
-from contextlib import closing
-from six import string_types
-import math
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-import paddle.fluid.unique_name as nameGen
 from paddle.fluid import core
-import unittest
-from multiprocessing import Process
 import paddle.fluid.layers as layers
-from functools import reduce
 from test_collective_base import TestCollectiveRunnerBase, runtime_main
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/detected_gpu.py b/python/paddle/fluid/tests/unittests/detected_gpu.py
index 28e0cc78760302fafc6f7f191fb3078c6c4f796c..47287278ed96d4693270924f66fc9b418ad6d396 100644
--- a/python/paddle/fluid/tests/unittests/detected_gpu.py
+++ b/python/paddle/fluid/tests/unittests/detected_gpu.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import sys
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/detected_xpu.py b/python/paddle/fluid/tests/unittests/detected_xpu.py
index a1b4b2ec1ecfffeeddf2c94d87be943b64178b19..dfc169307af72dd4a0da50cb5d994a666613e00a 100644
--- a/python/paddle/fluid/tests/unittests/detected_xpu.py
+++ b/python/paddle/fluid/tests/unittests/detected_xpu.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import sys
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/dist_allreduce_op.py b/python/paddle/fluid/tests/unittests/dist_allreduce_op.py
index 2e1358deabe8e537888be7034750195dbec5445f..49ef5d64bc73b67452b0fc010fa28a6c8c9befaa 100644
--- a/python/paddle/fluid/tests/unittests/dist_allreduce_op.py
+++ b/python/paddle/fluid/tests/unittests/dist_allreduce_op.py
@@ -12,19 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import time
-import math
-
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-from paddle.fluid import core
-import unittest
-from multiprocessing import Process
-import os
-import signal
 from functools import reduce
 from test_dist_base import TestDistRunnerBase, runtime_main
 
diff --git a/python/paddle/fluid/tests/unittests/dist_fleet_ctr.py b/python/paddle/fluid/tests/unittests/dist_fleet_ctr.py
index 8d1071ccda074769e3dca40c8ec81807eaa38f73..53ef00064bfca9f63127c029822711062b2217ba 100644
--- a/python/paddle/fluid/tests/unittests/dist_fleet_ctr.py
+++ b/python/paddle/fluid/tests/unittests/dist_fleet_ctr.py
@@ -26,8 +26,6 @@ import numpy as np
 
 import ctr_dataset_reader
 from test_dist_fleet_base import runtime_main, FleetDistRunnerBase
-from paddle.distributed.fleet.utils.ps_util import DistributedInfer
-import paddle.distributed.fleet as fleet
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/dist_fleet_ctr_ps_gpu.py b/python/paddle/fluid/tests/unittests/dist_fleet_ctr_ps_gpu.py
index 9f927a5bb3b8f6614b406d5b5e66e7be72fd63d8..13ec262697e5d61d4af5aa04b954be1ee8b767f7 100644
--- a/python/paddle/fluid/tests/unittests/dist_fleet_ctr_ps_gpu.py
+++ b/python/paddle/fluid/tests/unittests/dist_fleet_ctr_ps_gpu.py
@@ -25,7 +25,7 @@ import os
 import numpy as np
 
 import ctr_dataset_reader
-from test_dist_fleet_base import runtime_main, FleetDistRunnerBase
+from test_dist_fleet_base import runtime_main
 from dist_fleet_ctr import TestDistCTR2x2, fake_ctr_reader
 
 # Fix seed for test
diff --git a/python/paddle/fluid/tests/unittests/dist_fleet_debug_gloo.py b/python/paddle/fluid/tests/unittests/dist_fleet_debug_gloo.py
index 246404eb8ad5acbd39654d1b58996fd007749a9e..82f7a2bc672edf22920382e5367ab48e971501aa 100644
--- a/python/paddle/fluid/tests/unittests/dist_fleet_debug_gloo.py
+++ b/python/paddle/fluid/tests/unittests/dist_fleet_debug_gloo.py
@@ -12,16 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
-import time
-import numpy as np
 import logging
-import paddle
-import paddle.fluid as fluid
 #import paddle.fluid.incubate.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet.base.role_maker as role_maker
 from paddle.fluid.incubate.fleet.parameter_server.distribute_transpiler import fleet
-from paddle.fluid.transpiler.distribute_transpiler import DistributeTranspilerConfig
 
 logging.basicConfig(format="%(asctime)s - %(levelname)s - %(message)s")
 logger = logging.getLogger("fluid")
diff --git a/python/paddle/fluid/tests/unittests/dist_fleet_heter_pipeline_ctr.py b/python/paddle/fluid/tests/unittests/dist_fleet_heter_pipeline_ctr.py
index eb3f51a0240884935f6e6683a765e1a6e44009ed..c4e78ba16e05e83a21dbce9864b42db8e449ccf0 100644
--- a/python/paddle/fluid/tests/unittests/dist_fleet_heter_pipeline_ctr.py
+++ b/python/paddle/fluid/tests/unittests/dist_fleet_heter_pipeline_ctr.py
@@ -15,18 +15,14 @@
 Distribute CTR model for test fleet api
 """
 
-import shutil
-import tempfile
 import time
 
 import paddle
 import paddle.fluid as fluid
 import os
-import numpy as np
 
 import ctr_dataset_reader
 from test_dist_fleet_heter_base import runtime_main, FleetDistHeterRunnerBase
-from dist_fleet_ctr import TestDistCTR2x2, fake_ctr_reader
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/dist_fleet_raw_program_optimizer.py b/python/paddle/fluid/tests/unittests/dist_fleet_raw_program_optimizer.py
index 50a2089cd177e5afcb0ea33e06a2e3093040007a..54c37822257776516cd65664151442c4ed5b8572 100644
--- a/python/paddle/fluid/tests/unittests/dist_fleet_raw_program_optimizer.py
+++ b/python/paddle/fluid/tests/unittests/dist_fleet_raw_program_optimizer.py
@@ -13,12 +13,9 @@
 # limitations under the License.
 
 from test_dist_base import TestDistRunnerBase, runtime_main
-import unittest
 import paddle
-import os
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
-import numpy as np
 from functools import reduce
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/dist_fleet_raw_program_optimizer_fuse_allreduce.py b/python/paddle/fluid/tests/unittests/dist_fleet_raw_program_optimizer_fuse_allreduce.py
index 003de5458786e33a01af2e40608c83c6f58238e9..5db0377b36a0e9a1417559c2a1bc70d5b856478a 100644
--- a/python/paddle/fluid/tests/unittests/dist_fleet_raw_program_optimizer_fuse_allreduce.py
+++ b/python/paddle/fluid/tests/unittests/dist_fleet_raw_program_optimizer_fuse_allreduce.py
@@ -13,12 +13,9 @@
 # limitations under the License.
 
 from test_dist_base import TestDistRunnerBase, runtime_main
-import unittest
 import paddle
-import os
 import paddle.distributed.fleet as fleet
 import paddle.distributed.fleet.base.role_maker as role_maker
-import numpy as np
 from functools import reduce
 import paddle.fluid as fluid
 
diff --git a/python/paddle/fluid/tests/unittests/dist_fleet_simnet_bow.py b/python/paddle/fluid/tests/unittests/dist_fleet_simnet_bow.py
index 4b6cef5d4b9b507e01c79da1845370e909893e3f..84687999d9c5051f53f61342d6e68be4d54fe643 100644
--- a/python/paddle/fluid/tests/unittests/dist_fleet_simnet_bow.py
+++ b/python/paddle/fluid/tests/unittests/dist_fleet_simnet_bow.py
@@ -13,22 +13,11 @@
 # limitations under the License.
 
 import numpy as np
-import argparse
 import time
-import math
-import random
-import shutil
-import tempfile
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-from paddle.fluid import core
-import unittest
-from multiprocessing import Process
 import os
-import signal
-from functools import reduce
 from test_dist_fleet_base import runtime_main, FleetDistRunnerBase
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/dist_fleet_sparse_embedding_ctr.py b/python/paddle/fluid/tests/unittests/dist_fleet_sparse_embedding_ctr.py
index b7130ee1b331cd126a2a870bdb23c90beb73b046..c6a976b089b4ab52077dedc8c20064c0e3d3a2c2 100644
--- a/python/paddle/fluid/tests/unittests/dist_fleet_sparse_embedding_ctr.py
+++ b/python/paddle/fluid/tests/unittests/dist_fleet_sparse_embedding_ctr.py
@@ -16,9 +16,7 @@ Distribute CTR model for test fleet api
 """
 
 import os
-import time
 
-import random
 import numpy as np
 
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/dist_mnist.py b/python/paddle/fluid/tests/unittests/dist_mnist.py
index 47009dff2df56b64ac6234af37ef33bd99d5e81c..1a0f61411a3ace7bebc24d74d4f8fd08be213305 100644
--- a/python/paddle/fluid/tests/unittests/dist_mnist.py
+++ b/python/paddle/fluid/tests/unittests/dist_mnist.py
@@ -12,22 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import time
-import math
-
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-from paddle.fluid import core
-import unittest
-from multiprocessing import Process
-import os
-import signal
 from functools import reduce
 from test_dist_base import TestDistRunnerBase, runtime_main
-from paddle.fluid.incubate.fleet.collective import fleet, DistributedStrategy
+from paddle.fluid.incubate.fleet.collective import fleet
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/dist_mnist_batch_merge.py b/python/paddle/fluid/tests/unittests/dist_mnist_batch_merge.py
index 1ae4822d0ed098ecb1ed496f365289207c890e8a..67981130fc265ee7f4fc48973cd7dfba84b9ab85 100644
--- a/python/paddle/fluid/tests/unittests/dist_mnist_batch_merge.py
+++ b/python/paddle/fluid/tests/unittests/dist_mnist_batch_merge.py
@@ -12,20 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import time
-import math
-
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-from paddle.fluid import core
-import unittest
-from multiprocessing import Process
-import os
-import signal
-from functools import reduce
 from test_dist_base import TestDistRunnerBase, runtime_main
 from dist_mnist import cnn_model
 
diff --git a/python/paddle/fluid/tests/unittests/dist_mnist_lars.py b/python/paddle/fluid/tests/unittests/dist_mnist_lars.py
index 9c765ba15659e09389a42e40e9bc5b7bbf439d75..b93dfb0594eda43f29b635fcd2632f43730d1bbe 100644
--- a/python/paddle/fluid/tests/unittests/dist_mnist_lars.py
+++ b/python/paddle/fluid/tests/unittests/dist_mnist_lars.py
@@ -12,20 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import time
-import math
-
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-from paddle.fluid import core
-import unittest
-from multiprocessing import Process
-import os
-import signal
-from functools import reduce
 from test_dist_base import TestDistRunnerBase, runtime_main
 from dist_mnist import cnn_model
 
diff --git a/python/paddle/fluid/tests/unittests/dist_save_load.py b/python/paddle/fluid/tests/unittests/dist_save_load.py
index 8dbdd23fa855ba5f5104dfd0e974adaea8a3e2c1..b88e43ebad037de572daca2e37570c09608ef58c 100644
--- a/python/paddle/fluid/tests/unittests/dist_save_load.py
+++ b/python/paddle/fluid/tests/unittests/dist_save_load.py
@@ -14,18 +14,9 @@
 
 import os
 import sys
-import signal
-import subprocess
-import argparse
-import time
-import math
-import random
-from multiprocessing import Process
-from functools import reduce
 
 import numpy as np
 import pickle
-import unittest
 import six
 
 import paddle
@@ -33,7 +24,7 @@ import paddle.fluid as fluid
 from paddle.fluid import core
 from paddle.fluid import io
 
-from test_dist_base import TestDistRunnerBase, runtime_main, RUN_STEP
+from test_dist_base import RUN_STEP, runtime_main
 from dist_simnet_bow import TestDistSimnetBow2x2, DATA_URL, DATA_MD5
 
 
diff --git a/python/paddle/fluid/tests/unittests/dist_se_resnext.py b/python/paddle/fluid/tests/unittests/dist_se_resnext.py
index 269301f7b0da797876667897ff31a6eae3c065f7..5061bb8595615e234ca90d2cb54aad8480b6666a 100644
--- a/python/paddle/fluid/tests/unittests/dist_se_resnext.py
+++ b/python/paddle/fluid/tests/unittests/dist_se_resnext.py
@@ -12,20 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import time
 import math
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-from paddle.fluid import core
-import unittest
-from multiprocessing import Process
-import os
-import sys
-import signal
 from test_dist_base import TestDistRunnerBase, runtime_main
 
 paddle.enable_static()
diff --git a/python/paddle/fluid/tests/unittests/dist_sharding_save.py b/python/paddle/fluid/tests/unittests/dist_sharding_save.py
index 0fbc99cbf61af365bb09dd934cc6b73ec58e9f0d..b4733b61af85a8fcd9389306374af0ce49414dc2 100755
--- a/python/paddle/fluid/tests/unittests/dist_sharding_save.py
+++ b/python/paddle/fluid/tests/unittests/dist_sharding_save.py
@@ -14,10 +14,7 @@
 
 import paddle
 import paddle.fluid as fluid
-from test_dist_base import TestDistRunnerBase
-from dist_mnist import cnn_model
-# from paddle.fluid.incubate.fleet.collective import fleet
-import paddle.distributed.fleet as fleet
+from dist_mnist import cnn_model  # noqa: F401
 import paddle.distributed.fleet.base.role_maker as role_maker
 import paddle.distributed.fleet.meta_optimizers.sharding as sharding
 
diff --git a/python/paddle/fluid/tests/unittests/dist_text_classification.py b/python/paddle/fluid/tests/unittests/dist_text_classification.py
index f794e0be6d9eadf32001f553cd7e0bc087dd57a3..9b29d6b138b69ad855dd91b8038c96281f8c8fb5 100644
--- a/python/paddle/fluid/tests/unittests/dist_text_classification.py
+++ b/python/paddle/fluid/tests/unittests/dist_text_classification.py
@@ -12,24 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import time
-import math
-
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-from paddle.fluid import core
-import unittest
-from multiprocessing import Process
 import os
-import signal
 import six
 import tarfile
 import string
 import re
-from functools import reduce
 from test_dist_base import TestDistRunnerBase, runtime_main
 
 DTYPE = "float32"
diff --git a/python/paddle/fluid/tests/unittests/dist_transformer.py b/python/paddle/fluid/tests/unittests/dist_transformer.py
index 7b514e4d57226b33aa561806ffc18c6e51f8522e..b37b70cfeed67fde49bb6f2bdcf28fce03f2030a 100644
--- a/python/paddle/fluid/tests/unittests/dist_transformer.py
+++ b/python/paddle/fluid/tests/unittests/dist_transformer.py
@@ -13,15 +13,9 @@
 # limitations under the License.
 
 import numpy as np
-import argparse
 import time
-import math
 import os
-import sys
 import six
-import argparse
-import ast
-import multiprocessing
 import time
 from functools import partial
 from os.path import expanduser
@@ -29,16 +23,12 @@ import glob
 import random
 import tarfile
 
-import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-from paddle.fluid import core
 from test_dist_base import TestDistRunnerBase, runtime_main, RUN_STEP
 import paddle.compat as cpt
 from paddle.compat import long_type
 
-import hashlib
-
 const_para_attr = fluid.ParamAttr(initializer=fluid.initializer.Constant(0.001))
 const_bias_attr = const_para_attr
 
diff --git a/python/paddle/fluid/tests/unittests/dist_word2vec.py b/python/paddle/fluid/tests/unittests/dist_word2vec.py
index 7f420f764c079c2da052bd5e36a8ec603f217b73..ca322d30cdc62d971f0fb4d5dcfa711634025c60 100644
--- a/python/paddle/fluid/tests/unittests/dist_word2vec.py
+++ b/python/paddle/fluid/tests/unittests/dist_word2vec.py
@@ -12,18 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
-import argparse
-import time
-import math
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.profiler as profiler
-from paddle.fluid import core
-import unittest
-from multiprocessing import Process
 import os
-import signal
 from test_dist_base import TestDistRunnerBase, runtime_main
 
 IS_SPARSE = True
diff --git a/python/paddle/fluid/tests/unittests/distributed_fused_lamb_test_base.py b/python/paddle/fluid/tests/unittests/distributed_fused_lamb_test_base.py
index 3216f19b5c4a2daa16973972c04c2090d7dd3f27..230272a1cff77a3cb3dbc445de3b2f6406c25d26 100644
--- a/python/paddle/fluid/tests/unittests/distributed_fused_lamb_test_base.py
+++ b/python/paddle/fluid/tests/unittests/distributed_fused_lamb_test_base.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import argparse
 import os
 import paddle
 import paddle.fluid.core as core
@@ -21,11 +20,9 @@ from paddle.incubate import DistributedFusedLamb
 from paddle.vision.models import resnet18 as resnet
 from paddle.distributed.fleet.meta_optimizers.common import CollectiveHelper
 from paddle.fluid.clip import ClipGradBase
-import paddle.nn as nn
 import numpy as np
 import os
 import unittest
-from paddle.distributed.fleet.meta_optimizers.common import is_optimizer_op, is_backward_op
 from paddle.fluid.clip import _clip_by_global_norm_using_mp_type
 import distutils
 
diff --git a/python/paddle/fluid/tests/unittests/dygraph_fleet_api.py b/python/paddle/fluid/tests/unittests/dygraph_fleet_api.py
index 8e74efa3ceb691f9c70bbea8c0044c3b0751cce4..bf6139ffae680cf2d24f819714e76f432a724502 100644
--- a/python/paddle/fluid/tests/unittests/dygraph_fleet_api.py
+++ b/python/paddle/fluid/tests/unittests/dygraph_fleet_api.py
@@ -15,17 +15,9 @@
 import unittest
 import random
 import numpy as np
-import os
-import shutil
 
 import paddle
-import paddle.nn as nn
-from paddle.fluid import core
-import datetime
-from datetime import timedelta
-import paddle.fluid.core as core
 from paddle.fluid.framework import _test_eager_guard
-from paddle.fluid.dygraph.parallel import ParallelEnv
 
 
 class TestDygraphFleetAPI(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/dygraph_recompute_hybrid.py b/python/paddle/fluid/tests/unittests/dygraph_recompute_hybrid.py
index e67854437b1938695788057d8fd39b7fdf755cc7..105621498fed6fb424468b8afd0b6175b8449f88 100755
--- a/python/paddle/fluid/tests/unittests/dygraph_recompute_hybrid.py
+++ b/python/paddle/fluid/tests/unittests/dygraph_recompute_hybrid.py
@@ -16,14 +16,10 @@ import unittest
 import numpy as np
 
 import paddle
-from paddle.autograd import PyLayer
-from paddle.distributed.fleet.utils import recompute
 from paddle.incubate.distributed.fleet import recompute_hybrid
 import random
 from paddle.distributed import fleet
 
-import paddle.fluid.layers as layers
-
 
 def get_fc_block(block_idx, input_size, is_last=False):
     block_name = "block_" + str(block_idx)
diff --git a/python/paddle/fluid/tests/unittests/find_ports.py b/python/paddle/fluid/tests/unittests/find_ports.py
index b467a49213dd02b3160077ec63e79bda90094209..5618d4034483186d2b84d3f75b6e6075ce454c24 100644
--- a/python/paddle/fluid/tests/unittests/find_ports.py
+++ b/python/paddle/fluid/tests/unittests/find_ports.py
@@ -14,7 +14,6 @@
 
 import os
 import sys
-import time
 
 
 def train():
diff --git a/python/paddle/fluid/tests/unittests/fleet_heter_ps_training.py b/python/paddle/fluid/tests/unittests/fleet_heter_ps_training.py
index 3748894f4effdc588d80df28de0b58d307608c0e..e99021f282291d81bdcfa6be89fa612ecfd0c5ec 100644
--- a/python/paddle/fluid/tests/unittests/fleet_heter_ps_training.py
+++ b/python/paddle/fluid/tests/unittests/fleet_heter_ps_training.py
@@ -15,7 +15,6 @@
 import paddle
 import paddle.fluid as fluid
 import paddle.distributed.fleet as fleet
-import paddle.distributed.fleet.base.role_maker as role_maker
 
 fluid.disable_dygraph()
 
diff --git a/python/paddle/fluid/tests/unittests/gradient_checker.py b/python/paddle/fluid/tests/unittests/gradient_checker.py
index cee793f3ae967f2b30cdb4df8cd1c5976c3a071f..b947ff3bc4af30e1dbd6d2de9805767b1e63bb6a 100644
--- a/python/paddle/fluid/tests/unittests/gradient_checker.py
+++ b/python/paddle/fluid/tests/unittests/gradient_checker.py
@@ -13,16 +13,13 @@
 # limitations under the License.
 """This is the lib for gradient checker unittest."""
 
-import unittest
 import six
-import collections
 import numpy as np
 from itertools import product
 import paddle
 
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.executor import Executor
 from paddle.fluid.backward import _append_grad_suffix_, _as_list
 from paddle.fluid.framework import _test_eager_guard
 try:
diff --git a/python/paddle/fluid/tests/unittests/hccl_tools.py b/python/paddle/fluid/tests/unittests/hccl_tools.py
index ab35b36161b7902c8cf1a8f4bbc7dbe2bebf9e10..f47fe9962fe6d9bf283da77c544fd0520f3fbbe1 100644
--- a/python/paddle/fluid/tests/unittests/hccl_tools.py
+++ b/python/paddle/fluid/tests/unittests/hccl_tools.py
@@ -34,7 +34,6 @@ import sys
 import json
 import socket
 from argparse import ArgumentParser
-from typing import Dict, Any
 
 
 def parse_args():
diff --git a/python/paddle/fluid/tests/unittests/hdfs_test_utils.py b/python/paddle/fluid/tests/unittests/hdfs_test_utils.py
index 2dfa86f976644c3495a8ec156fc0bebe60c40f70..0f87e5603360110aabbe98b62743aa0323609190 100644
--- a/python/paddle/fluid/tests/unittests/hdfs_test_utils.py
+++ b/python/paddle/fluid/tests/unittests/hdfs_test_utils.py
@@ -13,13 +13,9 @@
 # limitations under the License.
 
 import unittest
-import paddle.fluid as fluid
-import paddle.fluid.incubate.fleet.base.role_maker as role_maker
-from paddle.fluid.incubate.fleet.collective import CollectiveOptimizer, fleet
 import os
-import sys
 
-from paddle.distributed.fleet.utils.fs import LocalFS, HDFSClient, FSTimeOut, FSFileExistsError, FSFileNotExistsError
+from paddle.distributed.fleet.utils.fs import FSFileExistsError, FSFileNotExistsError, HDFSClient, LocalFS
 
 java_home = os.environ["JAVA_HOME"]
 
diff --git a/python/paddle/fluid/tests/unittests/hybrid_parallel_pp_layer.py b/python/paddle/fluid/tests/unittests/hybrid_parallel_pp_layer.py
index c1609c975e6835c23b559a619a69706bb2fc6283..7cdce186cf8bc76261cb97570f723ecdb47d9e45 100644
--- a/python/paddle/fluid/tests/unittests/hybrid_parallel_pp_layer.py
+++ b/python/paddle/fluid/tests/unittests/hybrid_parallel_pp_layer.py
@@ -14,8 +14,6 @@
 
 import unittest
 import numpy as np
-import os
-import paddle
 from paddle.distributed import fleet
 from paddle.fluid.dygraph.container import Sequential
 import paddle.nn as nn
diff --git a/python/paddle/fluid/tests/unittests/ir_memory_optimize_net_base.py b/python/paddle/fluid/tests/unittests/ir_memory_optimize_net_base.py
index cc3e1c2961efd32dc7ae5e42d5042e4647833374..ca518747821b03116669c2c0c8b87c78669d7829 100644
--- a/python/paddle/fluid/tests/unittests/ir_memory_optimize_net_base.py
+++ b/python/paddle/fluid/tests/unittests/ir_memory_optimize_net_base.py
@@ -14,11 +14,9 @@
 
 import os
 import sys
-import six
 import unittest
 import time
 import math
-import multiprocessing
 import numpy as np
 
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/launch_function_helper.py b/python/paddle/fluid/tests/unittests/launch_function_helper.py
index d5eb73057b9a6e46a9aec6b241b69515edd85386..992bc58b5e490a9b547c049b3790c65204254a97 100644
--- a/python/paddle/fluid/tests/unittests/launch_function_helper.py
+++ b/python/paddle/fluid/tests/unittests/launch_function_helper.py
@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from multiprocessing import Pool, Process
+from multiprocessing import Process
 import os
 import socket
 from contextlib import closing
diff --git a/python/paddle/fluid/tests/unittests/my_data_generator.py b/python/paddle/fluid/tests/unittests/my_data_generator.py
index 00fd636467c2f239cdae863f48dfe87fd06dadca..5279973e01acfcdeabf80731df4771808a165f2c 100644
--- a/python/paddle/fluid/tests/unittests/my_data_generator.py
+++ b/python/paddle/fluid/tests/unittests/my_data_generator.py
@@ -12,12 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys
-import os
-import paddle
-import re
-import collections
-import time
 import paddle.distributed.fleet as fleet
 
 
diff --git a/python/paddle/fluid/tests/unittests/nproc_process.py b/python/paddle/fluid/tests/unittests/nproc_process.py
index e8b8ea11440d13595fe9cd88e9bd2da76b46182f..bbd0b6a0e5ee6a619ddaf0702345dbcdff2778fc 100644
--- a/python/paddle/fluid/tests/unittests/nproc_process.py
+++ b/python/paddle/fluid/tests/unittests/nproc_process.py
@@ -14,7 +14,6 @@
 
 import os
 import sys
-import time
 import paddle.fluid as fluid
 
 
diff --git a/python/paddle/fluid/tests/unittests/op_test.py b/python/paddle/fluid/tests/unittests/op_test.py
index 18eaae293b3df07f43e754d1dadb5042d493cdae..e4360253aeeae4cb37ee9857b97a879fd3aa3514 100644
--- a/python/paddle/fluid/tests/unittests/op_test.py
+++ b/python/paddle/fluid/tests/unittests/op_test.py
@@ -20,9 +20,6 @@ import numpy as np
 import random
 import six
 import struct
-import time
-import itertools
-import collections
 from collections import defaultdict
 from copy import copy
 
@@ -35,7 +32,7 @@ from paddle.fluid.framework import _test_eager_guard
 from paddle.fluid.backward import append_backward
 from paddle.fluid.op import Operator
 from paddle.fluid.executor import Executor
-from paddle.fluid.framework import Program, OpProtoHolder, Variable, _current_expected_place
+from paddle.fluid.framework import OpProtoHolder, Program, _current_expected_place
 from paddle.fluid import unique_name
 from paddle.fluid.dygraph.dygraph_to_static.utils import parse_arg_and_kwargs
 
@@ -1423,7 +1420,6 @@ class OpTest(unittest.TestCase):
                 judge whether convert current output and expect to uint16.
                 return True | False
                 """
-                pass
 
             def _is_skip_name(self, name):
                 if name not in self.expects:
diff --git a/python/paddle/fluid/tests/unittests/op_test_xpu.py b/python/paddle/fluid/tests/unittests/op_test_xpu.py
index 8c5348deae93ab21b841b68783c7fd15a137df57..82c8eb73969f153c8e4b7af63d3e7561d25144ea 100644
--- a/python/paddle/fluid/tests/unittests/op_test_xpu.py
+++ b/python/paddle/fluid/tests/unittests/op_test_xpu.py
@@ -12,30 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
-import unittest
-import warnings
 import numpy as np
-import random
-import six
-import struct
-import time
-import itertools
-import collections
-from collections import defaultdict
 
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 from paddle.fluid.backward import append_backward
-from paddle.fluid.op import Operator
-from paddle.fluid.executor import Executor
-from paddle.fluid.framework import Program, OpProtoHolder, Variable, convert_np_dtype_to_dtype_
-from testsuite import create_op, set_input, append_input_output, append_loss_ops
-from paddle.fluid import unique_name
-from white_list import op_accuracy_white_list, check_shape_white_list, compile_vs_runtime_white_list, no_check_set_white_list
+from paddle.fluid.framework import Program, convert_np_dtype_to_dtype_
+from testsuite import append_loss_ops, create_op, set_input
 from white_list import op_threshold_white_list, no_grad_set_white_list
-from op_test import OpTest, _set_use_system_allocator, get_numeric_gradient
+from op_test import OpTest
 from xpu.get_test_cover_info import is_empty_grad_op_type, get_xpu_op_support_types, type_dict_str_to_numpy
 
 
diff --git a/python/paddle/fluid/tests/unittests/parallel_dygraph_dataparallel_with_pylayer.py b/python/paddle/fluid/tests/unittests/parallel_dygraph_dataparallel_with_pylayer.py
index e2e7d1ff94bed04a117bada7acec161568a65484..b85caf2c966ec4fa79c0586ea6de8458144e8348 100644
--- a/python/paddle/fluid/tests/unittests/parallel_dygraph_dataparallel_with_pylayer.py
+++ b/python/paddle/fluid/tests/unittests/parallel_dygraph_dataparallel_with_pylayer.py
@@ -17,9 +17,7 @@ import unittest
 import paddle
 import numpy as np
 import paddle.distributed as dist
-from paddle.fluid.dygraph.nn import Linear
 from paddle.autograd import PyLayer
-from paddle.fluid.framework import in_dygraph_mode, _in_legacy_dygraph
 from paddle.distributed.fleet.utils.hybrid_parallel_util import fused_allreduce_gradients
 
 batch = 5
diff --git a/python/paddle/fluid/tests/unittests/parallel_dygraph_gradient_check.py b/python/paddle/fluid/tests/unittests/parallel_dygraph_gradient_check.py
index 6826c86b0d61e330c4172864b19d2b86c98d555a..bb66e117f339e35cedd873c533345cfca5097388 100644
--- a/python/paddle/fluid/tests/unittests/parallel_dygraph_gradient_check.py
+++ b/python/paddle/fluid/tests/unittests/parallel_dygraph_gradient_check.py
@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import unittest
-import os
 
 import paddle
 import numpy as np
diff --git a/python/paddle/fluid/tests/unittests/parallel_dygraph_gradient_check_in_eager_mode.py b/python/paddle/fluid/tests/unittests/parallel_dygraph_gradient_check_in_eager_mode.py
index 4f6d4a7716c9331e915ac42467748c4acee59629..506e025225d42817b043a60065bd8d5717667bfa 100644
--- a/python/paddle/fluid/tests/unittests/parallel_dygraph_gradient_check_in_eager_mode.py
+++ b/python/paddle/fluid/tests/unittests/parallel_dygraph_gradient_check_in_eager_mode.py
@@ -13,8 +13,6 @@
 # limitations under the License.
 
 import unittest
-import os
-import copy
 
 import paddle
 import numpy as np
@@ -22,8 +20,6 @@ import paddle.distributed as dist
 import paddle.fluid as fluid
 from paddle.fluid.dygraph.nn import Linear
 from paddle.fluid.framework import _test_eager_guard
-from paddle.fluid.dygraph.parallel import ParallelEnv
-import paddle.fluid.core as core
 
 paddle.seed(1024)
 np.random.seed(2021)
diff --git a/python/paddle/fluid/tests/unittests/parallel_dygraph_mnist.py b/python/paddle/fluid/tests/unittests/parallel_dygraph_mnist.py
index 8917a82325d63d131fb469a4f12c1e82bef0455a..8b07142ac2efb518f06e206e59ea0ef53731de92 100644
--- a/python/paddle/fluid/tests/unittests/parallel_dygraph_mnist.py
+++ b/python/paddle/fluid/tests/unittests/parallel_dygraph_mnist.py
@@ -12,18 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
-import contextlib
-import unittest
 import numpy as np
-import six
-import pickle
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.dygraph as dygraph
-from paddle.fluid import core
-from paddle.fluid.optimizer import SGDOptimizer
 from paddle.fluid.dygraph.nn import Conv2D, Pool2D, Linear
 from paddle.fluid.dygraph.base import to_variable
 
diff --git a/python/paddle/fluid/tests/unittests/parallel_dygraph_none_var.py b/python/paddle/fluid/tests/unittests/parallel_dygraph_none_var.py
index 8659da4d65847d3f3a29e87a9636d194b1ab0d18..5713c93920f75e3c92ea1b54ab26c409aa50417b 100644
--- a/python/paddle/fluid/tests/unittests/parallel_dygraph_none_var.py
+++ b/python/paddle/fluid/tests/unittests/parallel_dygraph_none_var.py
@@ -12,16 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import contextlib
-import unittest
 import numpy as np
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.dygraph as dygraph
-from paddle.fluid import core
-from paddle.fluid.optimizer import SGDOptimizer
-from paddle.fluid.dygraph.nn import Linear
 
 from test_dist_base import runtime_main, TestParallelDyGraphRunnerBase
 
diff --git a/python/paddle/fluid/tests/unittests/parallel_dygraph_shared_unused_var.py b/python/paddle/fluid/tests/unittests/parallel_dygraph_shared_unused_var.py
index f41a872cc501785587bbc123e201d4368c92ebcd..851bf3b2fdc89eb2b32e96ad0f32dd032d8fd8ed 100644
--- a/python/paddle/fluid/tests/unittests/parallel_dygraph_shared_unused_var.py
+++ b/python/paddle/fluid/tests/unittests/parallel_dygraph_shared_unused_var.py
@@ -12,12 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest
 import numpy as np
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid.optimizer import SGDOptimizer
-from paddle.fluid.dygraph.nn import Conv2D, Pool2D, Linear
+from paddle.fluid.dygraph.nn import Linear
 from paddle.fluid.dygraph.base import to_variable
 from test_dist_base import runtime_main, TestParallelDyGraphRunnerBase
 
diff --git a/python/paddle/fluid/tests/unittests/parallel_dygraph_sparse_embedding_over_height.py b/python/paddle/fluid/tests/unittests/parallel_dygraph_sparse_embedding_over_height.py
index 5068853f5c5e5e91364adc5fe56fdfae00a6f9be..7bd30deea6407078f91f9250628e4c2a6284e413 100644
--- a/python/paddle/fluid/tests/unittests/parallel_dygraph_sparse_embedding_over_height.py
+++ b/python/paddle/fluid/tests/unittests/parallel_dygraph_sparse_embedding_over_height.py
@@ -16,7 +16,7 @@ import paddle
 import paddle.fluid as fluid
 from parallel_dygraph_sparse_embedding import SimpleNet, fake_sample_reader, TestSparseEmbedding
 
-from test_dist_base import runtime_main, TestParallelDyGraphRunnerBase
+from test_dist_base import runtime_main
 
 # global configs
 # using small `vocab_size` to test rows number over height
diff --git a/python/paddle/fluid/tests/unittests/ps_dnn_model.py b/python/paddle/fluid/tests/unittests/ps_dnn_model.py
index 8841ea742f0c9d51f0ab47236895be79745bc04a..89472c73bd31dde5c27c111ba7f241a5a93d6510 100755
--- a/python/paddle/fluid/tests/unittests/ps_dnn_model.py
+++ b/python/paddle/fluid/tests/unittests/ps_dnn_model.py
@@ -14,9 +14,7 @@
 
 import paddle
 import paddle.nn as nn
-import paddle.nn.functional as F
 import math
-import paddle.distributed.fleet as fleet
 
 
 class DNNLayer(nn.Layer):
diff --git a/python/paddle/fluid/tests/unittests/seresnext_net.py b/python/paddle/fluid/tests/unittests/seresnext_net.py
index e2233cdbe2db8c6f9dfceaed98f92711d72e9959..d1676380afefb6c6bb71c002f4c3db42b6505de9 100644
--- a/python/paddle/fluid/tests/unittests/seresnext_net.py
+++ b/python/paddle/fluid/tests/unittests/seresnext_net.py
@@ -17,11 +17,9 @@ import paddle.fluid as fluid
 fluid.core._set_eager_deletion_mode(-1, -1, False)
 
 import paddle
-import paddle.fluid.layers.ops as ops
 from paddle.fluid.layers.learning_rate_scheduler import cosine_decay
 from simple_nets import init_data
 from seresnext_test_base import DeviceType
-import math
 import os
 
 os.environ['CPU_NUM'] = str(4)
diff --git a/python/paddle/fluid/tests/unittests/simnet_dataset_reader.py b/python/paddle/fluid/tests/unittests/simnet_dataset_reader.py
index c9125bb08227a979b86b4c3dd0be57aa591fc051..5eae0ff22e14df8787d45b922ad32f0341849f83 100644
--- a/python/paddle/fluid/tests/unittests/simnet_dataset_reader.py
+++ b/python/paddle/fluid/tests/unittests/simnet_dataset_reader.py
@@ -12,13 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import logging
-import tarfile
 
-import random
-
-import paddle
 import paddle.distributed.fleet as fleet
 
 logging.basicConfig()
diff --git a/python/paddle/fluid/tests/unittests/static_model_parallel_fused_multi_transformer.py b/python/paddle/fluid/tests/unittests/static_model_parallel_fused_multi_transformer.py
index 446689e085ca7472e9080e96bde929ca64822bd0..0ab441d29631620e24ad1243fbce8ca32e29f5b3 100644
--- a/python/paddle/fluid/tests/unittests/static_model_parallel_fused_multi_transformer.py
+++ b/python/paddle/fluid/tests/unittests/static_model_parallel_fused_multi_transformer.py
@@ -20,12 +20,6 @@ from test_dist_base import TestDistRunnerBase, runtime_main
 from paddle.incubate.nn import FusedMultiTransformer
 import paddle.distributed.fleet as fleet
 
-from paddle.fluid.data_feeder import check_variable_and_dtype, check_dtype
-from paddle.fluid.dygraph.layers import Layer
-from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid import core
-from paddle.nn.initializer import Constant
-
 paddle.enable_static()
 
 
diff --git a/python/paddle/fluid/tests/unittests/transformer_model.py b/python/paddle/fluid/tests/unittests/transformer_model.py
index 4130ba7a2cc9a0951b586946b2d90601185275d4..7fd02339ec910c19d7b2e73b95a29cdaa975899a 100644
--- a/python/paddle/fluid/tests/unittests/transformer_model.py
+++ b/python/paddle/fluid/tests/unittests/transformer_model.py
@@ -15,7 +15,6 @@
 from functools import partial
 import numpy as np
 
-import os
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
 
diff --git a/python/paddle/fluid/tests/unittests/utils.py b/python/paddle/fluid/tests/unittests/utils.py
index 66376382a97245e7736ae24e02e3e8b9fa6d343f..346d40025837b915dc9c0a9f3891eda0806536e7 100644
--- a/python/paddle/fluid/tests/unittests/utils.py
+++ b/python/paddle/fluid/tests/unittests/utils.py
@@ -14,12 +14,7 @@
 
 from paddle.fluid.framework import _dygraph_guard
 import paddle.fluid as fluid
-from paddle.fluid.framework import Variable
-import paddle.fluid.dygraph.jit as jit
-from paddle.fluid.dygraph.jit import extract_vars
 import numpy as np
-import os
-import time
 
 __all__ = ['DyGraphProgramDescTracerTestHelper', 'is_equal_program']