diff --git a/python/paddle/fluid/tests/unittests/test_label_smooth_functional.py b/python/paddle/fluid/tests/unittests/test_label_smooth_functional.py
index 2fef18fd6b5a5470287efc6c196eed43a9808564..c5859b7311659f5af41465ad2d8049e681957da8 100644
--- a/python/paddle/fluid/tests/unittests/test_label_smooth_functional.py
+++ b/python/paddle/fluid/tests/unittests/test_label_smooth_functional.py
@@ -14,10 +14,9 @@
 
 import numpy as np
 import paddle
-from paddle import fluid, nn
+from paddle import fluid
 import paddle.fluid.dygraph as dg
 import paddle.nn.functional as F
-import paddle.fluid.initializer as I
 import unittest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_lamb_op.py b/python/paddle/fluid/tests/unittests/test_lamb_op.py
index 03374d3d07885d9936e6064bf952fce4a37a1893..eaa8db70313085be19f6d64e960944426104f273 100644
--- a/python/paddle/fluid/tests/unittests/test_lamb_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lamb_op.py
@@ -16,7 +16,6 @@ import unittest
 import numpy as np
 from op_test import OpTest
 import paddle
-import paddle.fluid as fluid
 from paddle.fluid import core
 from paddle.fluid.op import Operator
 
diff --git a/python/paddle/fluid/tests/unittests/test_lambv2_op.py b/python/paddle/fluid/tests/unittests/test_lambv2_op.py
index ff18e53bb0b021cf172dd10f9900bdc43f5c3c1a..1e01f3a4ce3940b407523d65adc5b1f6c9a652d9 100644
--- a/python/paddle/fluid/tests/unittests/test_lambv2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lambv2_op.py
@@ -14,9 +14,7 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest
 from paddle.fluid import core
-from paddle.fluid.op import Operator
 from paddle.fluid.dygraph.base import switch_to_static_graph
 import paddle
 import paddle.fluid as fluid
diff --git a/python/paddle/fluid/tests/unittests/test_launch_coverage.py b/python/paddle/fluid/tests/unittests/test_launch_coverage.py
index 8f9b39b0a48a522403f51f2c4999b5bd1e590614..00db6590d6f3fa4c71411c827967e70aab0160f0 100644
--- a/python/paddle/fluid/tests/unittests/test_launch_coverage.py
+++ b/python/paddle/fluid/tests/unittests/test_launch_coverage.py
@@ -12,14 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys
-import subprocess
-import os
-import time
-import six
-import copy
 import unittest
-import paddle.fluid as fluid
 
 from argparse import ArgumentParser, REMAINDER
 from paddle.distributed.utils.launch_utils import _print_arguments, get_gpus, get_cluster_from_args
diff --git a/python/paddle/fluid/tests/unittests/test_layer_norm_op_v2.py b/python/paddle/fluid/tests/unittests/test_layer_norm_op_v2.py
index 62a0f00eba3496058b516098b8993e2ca27b5a9b..8d6dfab71990bf10f272b14881c4162c6f8dc5eb 100644
--- a/python/paddle/fluid/tests/unittests/test_layer_norm_op_v2.py
+++ b/python/paddle/fluid/tests/unittests/test_layer_norm_op_v2.py
@@ -12,14 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import unittest
 import numpy as np
 import paddle.fluid.core as core
-from paddle.fluid.op import Operator
 import paddle.fluid as fluid
-from op_test import OpTest, _set_use_system_allocator
-from paddle.fluid.framework import grad_var_name, _test_eager_guard
+from paddle.fluid.framework import _test_eager_guard
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/test_layout_autotune.py b/python/paddle/fluid/tests/unittests/test_layout_autotune.py
index 497bcd89e176a0b36cf4653d90c0a26cc31a3f93..e004850587f4fe4ec6df6001c826237dca72bb24 100644
--- a/python/paddle/fluid/tests/unittests/test_layout_autotune.py
+++ b/python/paddle/fluid/tests/unittests/test_layout_autotune.py
@@ -17,7 +17,6 @@ import json
 import tempfile
 import unittest
 import warnings
-import numpy
 
 import paddle
 import paddle.nn.functional as F
diff --git a/python/paddle/fluid/tests/unittests/test_lcm.py b/python/paddle/fluid/tests/unittests/test_lcm.py
index d03e9f5998f87cff0b73fa7ea3e6f2907459a9f8..6f113c13a01a70daa60ef5b5313ede90dedc07aa 100644
--- a/python/paddle/fluid/tests/unittests/test_lcm.py
+++ b/python/paddle/fluid/tests/unittests/test_lcm.py
@@ -17,8 +17,6 @@ import numpy as np
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid import Program, program_guard
-from op_test import OpTest
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_learning_rate_scheduler.py b/python/paddle/fluid/tests/unittests/test_learning_rate_scheduler.py
index 5ea1a7638c54d68e2eccc9a3d4c17bfa8fb433d7..bd73f628a02986bfca63c7adc7f5a81bde59b843 100644
--- a/python/paddle/fluid/tests/unittests/test_learning_rate_scheduler.py
+++ b/python/paddle/fluid/tests/unittests/test_learning_rate_scheduler.py
@@ -17,7 +17,6 @@ import math
 import numpy as np
 import unittest
 
-import paddle
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
 import paddle.fluid.framework as framework
diff --git a/python/paddle/fluid/tests/unittests/test_linalg_pinv_op.py b/python/paddle/fluid/tests/unittests/test_linalg_pinv_op.py
index 247e3861c3793dfc602a359c5ee58ec94809f7bf..03e671d883219b7a5f9c75dc24250a569b8765ca 100644
--- a/python/paddle/fluid/tests/unittests/test_linalg_pinv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_linalg_pinv_op.py
@@ -16,11 +16,7 @@ import unittest
 import numpy as np
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
-from op_test import OpTest, skip_check_grad_ci
-from gradient_checker import grad_check
-from decorator_helper import prog_scope
 
 
 class LinalgPinvTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_linear.py b/python/paddle/fluid/tests/unittests/test_linear.py
index 65cc224eed5b7298f617029f8aaa25ea309ba275..eaf2cb528cc2a8e66a7373bfc70bbd3d4b3e709f 100644
--- a/python/paddle/fluid/tests/unittests/test_linear.py
+++ b/python/paddle/fluid/tests/unittests/test_linear.py
@@ -15,12 +15,9 @@
 import unittest
 import numpy as np
 import paddle.fluid.core as core
-from op_test import OpTest
 import paddle
-from paddle import fluid, nn
-import paddle.fluid.dygraph as dg
+from paddle import fluid
 import paddle.nn.functional as F
-import paddle.fluid.initializer as I
 
 
 class LinearTestCase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_linspace.py b/python/paddle/fluid/tests/unittests/test_linspace.py
index c13581351531f6ca7e75e22ab89ddb216ddcf1e8..c38d5b1fe591b61a43ae9ae44fd121807d6a314b 100644
--- a/python/paddle/fluid/tests/unittests/test_linspace.py
+++ b/python/paddle/fluid/tests/unittests/test_linspace.py
@@ -17,7 +17,7 @@ import numpy as np
 from op_test import OpTest
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid import compiler, Program, program_guard
+from paddle.fluid import Program, program_guard
 from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py b/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py
index 62bf274a4e46e86856452942992ded32b8d581cd..62e063179fa4c840ddb6c361ae654561c59a67ac 100644
--- a/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py
@@ -19,12 +19,9 @@ silentremove("test_list_and_serv_run_empty_optimize_block.flag")
 
 import paddle
 import paddle.fluid as fluid
-import signal
-import subprocess
 import time
 import unittest
 from multiprocessing import Process
-from op_test import OpTest
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_load_op.py b/python/paddle/fluid/tests/unittests/test_load_op.py
index 534c6d832e6cd6d3d868d42e855ad7f332064dc8..1b81f3b8f40965a19e4ea74e76c3e1a022695911 100644
--- a/python/paddle/fluid/tests/unittests/test_load_op.py
+++ b/python/paddle/fluid/tests/unittests/test_load_op.py
@@ -14,7 +14,6 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest, randomize_probability
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
 import os
diff --git a/python/paddle/fluid/tests/unittests/test_load_op_xpu.py b/python/paddle/fluid/tests/unittests/test_load_op_xpu.py
index 0ec944aba93962472f2360da5b26f94cba294653..957fe5aa42075be7c939865b0822d5c0576973c3 100644
--- a/python/paddle/fluid/tests/unittests/test_load_op_xpu.py
+++ b/python/paddle/fluid/tests/unittests/test_load_op_xpu.py
@@ -16,7 +16,6 @@ import unittest
 import numpy as np
 import os
 import tempfile
-from op_test import OpTest, randomize_probability
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/test_load_vars_shape_check.py b/python/paddle/fluid/tests/unittests/test_load_vars_shape_check.py
index 566c4929bf76acab7b74c042c10ed5f387b18bfd..2d9bd1ac650909248e84c926edad835f9b675ae6 100644
--- a/python/paddle/fluid/tests/unittests/test_load_vars_shape_check.py
+++ b/python/paddle/fluid/tests/unittests/test_load_vars_shape_check.py
@@ -15,8 +15,6 @@
 import unittest
 import os
 import shutil
-import numpy as np
-import paddle as paddle
 import paddle.fluid as fluid
 from paddle.fluid.executor import Executor
 
diff --git a/python/paddle/fluid/tests/unittests/test_lod_append_op.py b/python/paddle/fluid/tests/unittests/test_lod_append_op.py
index 7a7d76eee737f9b4dcf70b0817b809a99c3f8cfd..23d828b3cd78a4df22c40d2e0c05ba6565fad98e 100644
--- a/python/paddle/fluid/tests/unittests/test_lod_append_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lod_append_op.py
@@ -15,11 +15,7 @@
 import unittest
 import numpy as np
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
-import paddle.fluid.core as core
-from paddle.fluid import compiler, Program, program_guard
-from paddle.fluid.op import Operator
-from paddle.fluid.backward import append_backward
+from paddle.fluid import Program
 
 
 class TestLoDAppendAPI(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_lod_array_length_op.py b/python/paddle/fluid/tests/unittests/test_lod_array_length_op.py
index 67f7ee93c6e7436de86c048a1a35b2c93575ec2f..4129c59edca1e15d05526db6d5bf310b60de6271 100644
--- a/python/paddle/fluid/tests/unittests/test_lod_array_length_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lod_array_length_op.py
@@ -19,7 +19,7 @@ import paddle.fluid.layers as layers
 from paddle.fluid.executor import Executor
 import paddle.fluid.core as core
 import paddle.fluid as fluid
-from paddle.fluid import compiler, Program, program_guard
+from paddle.fluid import Program, program_guard
 import numpy
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_logcumsumexp_op.py b/python/paddle/fluid/tests/unittests/test_logcumsumexp_op.py
index 55ffbe52a72bc68720b61b922db4064e5440ef47..566b65624e5729ada7d8953b7b88624e1e1594df 100644
--- a/python/paddle/fluid/tests/unittests/test_logcumsumexp_op.py
+++ b/python/paddle/fluid/tests/unittests/test_logcumsumexp_op.py
@@ -19,8 +19,6 @@ import numpy as np
 import paddle
 import paddle.fluid.core as core
 import paddle.fluid as fluid
-from paddle.fluid import compiler, Program, program_guard
-from paddle.fluid.framework import _test_eager_guard
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_logical_op.py b/python/paddle/fluid/tests/unittests/test_logical_op.py
index e9600ce8a78f88dec5bd49a8e1e5442ce0b2645f..c36445e7b0710f9cd83b7aed72f650d1c23ea4da 100755
--- a/python/paddle/fluid/tests/unittests/test_logical_op.py
+++ b/python/paddle/fluid/tests/unittests/test_logical_op.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import op_test
 import unittest
 import numpy as np
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/test_lookahead.py b/python/paddle/fluid/tests/unittests/test_lookahead.py
index 2e2024c1c40a4764ae845105f64627fd39863246..10c2ef78b861821babd8433bf1ae73f13832f7c2 100644
--- a/python/paddle/fluid/tests/unittests/test_lookahead.py
+++ b/python/paddle/fluid/tests/unittests/test_lookahead.py
@@ -14,13 +14,10 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest
-from paddle.fluid import core
-from paddle.fluid.op import Operator
 import paddle.fluid as fluid
 import paddle
 import paddle.nn as nn
-from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph
+from paddle.fluid.framework import _test_eager_guard
 
 LOOKAHEAD_K = 5
 LOOKAHEAD_ALPHA = 0.2
diff --git a/python/paddle/fluid/tests/unittests/test_lookup_table_dequant_op.py b/python/paddle/fluid/tests/unittests/test_lookup_table_dequant_op.py
index e04565a4c3a9bf7af79224e7af9a97b97b5a6636..bd15a3ac1cbf0ee689523d5530f8b73aaeb6d903 100644
--- a/python/paddle/fluid/tests/unittests/test_lookup_table_dequant_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lookup_table_dequant_op.py
@@ -14,12 +14,7 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest, skip_check_grad_ci
-import paddle.fluid.core as core
-from paddle.fluid.op import Operator
-import paddle.compat as cpt
-import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard
+from op_test import OpTest
 import struct
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_lookup_table_v2_bf16_op.py b/python/paddle/fluid/tests/unittests/test_lookup_table_v2_bf16_op.py
index 9509889f0bb4abb23a73de1de0e4a53f970ff7b8..a479693d518b26e5e43995c4be7d3a1fa7fbca2e 100644
--- a/python/paddle/fluid/tests/unittests/test_lookup_table_v2_bf16_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lookup_table_v2_bf16_op.py
@@ -15,8 +15,7 @@
 import unittest
 import numpy as np
 import paddle
-from paddle.fluid.tests.unittests.op_test import (skip_check_grad_ci,
-                                                  convert_uint16_to_float)
+from paddle.fluid.tests.unittests.op_test import convert_uint16_to_float
 from paddle.fluid.tests.unittests.test_lookup_table_bf16_op import (
     _lookup, TestLookupTableBF16Op, TestLookupTableBF16OpIds4D,
     TestLookupTableBF16OpWIsSelectedRows,
diff --git a/python/paddle/fluid/tests/unittests/test_lr_scheduler.py b/python/paddle/fluid/tests/unittests/test_lr_scheduler.py
index d4dac6143d4473a6b8af2941d0a5546938689189..2d76f141f9ff8ea2a66525a6734a5aec6e54298d 100644
--- a/python/paddle/fluid/tests/unittests/test_lr_scheduler.py
+++ b/python/paddle/fluid/tests/unittests/test_lr_scheduler.py
@@ -12,15 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import copy
 import math
 import numpy as np
 import unittest
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
-import paddle.fluid.framework as framework
 import paddle.fluid.core as core
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_lrn_op.py b/python/paddle/fluid/tests/unittests/test_lrn_op.py
index 96d76fcee2372b563fe494b7be0fb74ffef835fd..c87d3067cc4fde6e60725e9a2c317392a5462665 100644
--- a/python/paddle/fluid/tests/unittests/test_lrn_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lrn_op.py
@@ -18,7 +18,7 @@ import numpy as np
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 from op_test import OpTest
-from paddle.fluid import compiler, Program, program_guard
+from paddle.fluid import Program, program_guard
 
 
 class TestLRNOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_lstm_op.py b/python/paddle/fluid/tests/unittests/test_lstm_op.py
index 4d12b4311dffcb286c8bc3408e9a9802656c9f70..db701a7b733ce8b76f9672c84c678c35d1c72c5c 100644
--- a/python/paddle/fluid/tests/unittests/test_lstm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lstm_op.py
@@ -14,7 +14,7 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest, skip_check_grad_ci
+from op_test import OpTest
 from paddle import fluid
 from paddle.fluid.layers import lstm as LSTM
 from paddle.fluid.layers import fill_constant
diff --git a/python/paddle/fluid/tests/unittests/test_lu_op.py b/python/paddle/fluid/tests/unittests/test_lu_op.py
index 43ad2a027ee6a6e33ce6e92f3713768c5e7c7302..0c24bcd68650f6bf095c0c207c5c89486333dcf3 100644
--- a/python/paddle/fluid/tests/unittests/test_lu_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lu_op.py
@@ -18,7 +18,6 @@ import itertools
 import numpy as np
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
 import scipy
 import scipy.linalg
diff --git a/python/paddle/fluid/tests/unittests/test_lu_unpack_op.py b/python/paddle/fluid/tests/unittests/test_lu_unpack_op.py
index fad97b21975e65587695167d369112c3a4e547be..1ec36680fa4c27cdbd5973c07eb9481ede0b1352 100644
--- a/python/paddle/fluid/tests/unittests/test_lu_unpack_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lu_unpack_op.py
@@ -18,7 +18,6 @@ import itertools
 import numpy as np
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
 import scipy
 import scipy.linalg
diff --git a/python/paddle/fluid/tests/unittests/test_manual_seed.py b/python/paddle/fluid/tests/unittests/test_manual_seed.py
index 7ef2cee14a9ab0a34d9f357d2645ae662da1b175..7d9762c788abbd0feb6227135c7998566f0035d6 100644
--- a/python/paddle/fluid/tests/unittests/test_manual_seed.py
+++ b/python/paddle/fluid/tests/unittests/test_manual_seed.py
@@ -16,8 +16,6 @@ import unittest
 
 import paddle
 import paddle.fluid as fluid
-from paddle.framework import seed
-from paddle.fluid.framework import Program, default_main_program, default_startup_program
 import numpy as np
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_margin_cross_entropy_op.py b/python/paddle/fluid/tests/unittests/test_margin_cross_entropy_op.py
index 746a01039c9c31f36d2318a61a29d1294e5ae095..6473ab7568f1994b4bd9529df5e035906777b17b 100644
--- a/python/paddle/fluid/tests/unittests/test_margin_cross_entropy_op.py
+++ b/python/paddle/fluid/tests/unittests/test_margin_cross_entropy_op.py
@@ -15,10 +15,7 @@
 import unittest
 import numpy as np
 from op_test import OpTest
-import math
-import random
 import paddle
-import paddle.fluid as fluid
 from paddle.fluid import core
 from paddle.fluid import Program, program_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_marker_op.py b/python/paddle/fluid/tests/unittests/test_marker_op.py
index cdf132b72b1baab9ddc740222bf016daeb8f45c1..f0cb6ec1bbbf2b092203e1feb51b1e572d984d8d 100644
--- a/python/paddle/fluid/tests/unittests/test_marker_op.py
+++ b/python/paddle/fluid/tests/unittests/test_marker_op.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import unittest
-import numpy as np
 from op_test import OpTest
 from paddle.distributed.fleet.meta_optimizers.common import OpRole
 
diff --git a/python/paddle/fluid/tests/unittests/test_masked_select_op.py b/python/paddle/fluid/tests/unittests/test_masked_select_op.py
index 80b2e28f947f3906885447dcfbd44cd4d41e4199..4de07192dd08db14d91411e86513b91780ad4062 100644
--- a/python/paddle/fluid/tests/unittests/test_masked_select_op.py
+++ b/python/paddle/fluid/tests/unittests/test_masked_select_op.py
@@ -15,7 +15,6 @@
 import unittest
 import numpy as np
 from op_test import OpTest
-import paddle.fluid as fluid
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_math_op_patch_var_base.py b/python/paddle/fluid/tests/unittests/test_math_op_patch_var_base.py
index 05e774451b8a8aaaba0c909c803c17b1779c5e68..5c66d4cd6b5f1a63b74b2f6b8bfdafeb9dc45f6d 100644
--- a/python/paddle/fluid/tests/unittests/test_math_op_patch_var_base.py
+++ b/python/paddle/fluid/tests/unittests/test_math_op_patch_var_base.py
@@ -17,7 +17,7 @@ import paddle
 import paddle.fluid as fluid
 import numpy as np
 import inspect
-from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph
+from paddle.fluid.framework import _test_eager_guard
 
 
 class TestMathOpPatchesVarBase(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_matmul_op.py b/python/paddle/fluid/tests/unittests/test_matmul_op.py
index 4401c6ef812292f9ac74c9a1d35565bb388549fb..b8ca9b9dc1a92ae2d2e83a9864bc8483cef1848a 100644
--- a/python/paddle/fluid/tests/unittests/test_matmul_op.py
+++ b/python/paddle/fluid/tests/unittests/test_matmul_op.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle.fluid.core as core
 import unittest
 import numpy as np
 from op_test import OpTest
diff --git a/python/paddle/fluid/tests/unittests/test_matmul_v2_op.py b/python/paddle/fluid/tests/unittests/test_matmul_v2_op.py
index 7a2f75400beded2f64d3fec30b9be51dfe75cb2c..4caffe5019f7ccf5999efb353aa8438295cc7a03 100644
--- a/python/paddle/fluid/tests/unittests/test_matmul_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_matmul_v2_op.py
@@ -20,7 +20,6 @@ import paddle.fluid.core as core
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.framework as framework
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_matrix_power_op.py b/python/paddle/fluid/tests/unittests/test_matrix_power_op.py
index 92ce97d88215a3aa193b11bf6ae8d9081fde6961..af400b14615c08edd691bf5d17ed5d8c7d3b4f71 100644
--- a/python/paddle/fluid/tests/unittests/test_matrix_power_op.py
+++ b/python/paddle/fluid/tests/unittests/test_matrix_power_op.py
@@ -359,10 +359,8 @@ class TestMatrixPowerSingularAPI(unittest.TestCase):
                                   fetch_list=[result])
             except RuntimeError as ex:
                 print("The mat is singular")
-                pass
             except ValueError as ex:
                 print("The mat is singular")
-                pass
 
     def test_static(self):
         paddle.enable_static()
@@ -379,10 +377,8 @@ class TestMatrixPowerSingularAPI(unittest.TestCase):
                     result = paddle.linalg.matrix_power(input, -2)
                 except RuntimeError as ex:
                     print("The mat is singular")
-                    pass
                 except ValueError as ex:
                     print("The mat is singular")
-                    pass
 
 
 if __name__ == "__main__":
diff --git a/python/paddle/fluid/tests/unittests/test_matrix_rank_op.py b/python/paddle/fluid/tests/unittests/test_matrix_rank_op.py
index 316079a865072302d1eba600d4bd0223cb800b87..3c3dba880047d07ddbb7c152ea01c0c99013a158 100644
--- a/python/paddle/fluid/tests/unittests/test_matrix_rank_op.py
+++ b/python/paddle/fluid/tests/unittests/test_matrix_rank_op.py
@@ -16,13 +16,10 @@ import unittest
 
 import numpy as np
 
-from paddle.fluid.tests.unittests.op_test import OpTest, convert_float_to_uint16
+from paddle.fluid.tests.unittests.op_test import OpTest
 import paddle
-import paddle.nn as nn
-import paddle.nn.functional as F
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid import compiler, Program, program_guard
 
 paddle.enable_static()
 SEED = 2049
diff --git a/python/paddle/fluid/tests/unittests/test_max_min_amax_amin_op.py b/python/paddle/fluid/tests/unittests/test_max_min_amax_amin_op.py
index f7509ba1c8b09034e3500e52d5c09ef949a5f293..ee316bb0431e36451662f6549aced2f199e4971a 100644
--- a/python/paddle/fluid/tests/unittests/test_max_min_amax_amin_op.py
+++ b/python/paddle/fluid/tests/unittests/test_max_min_amax_amin_op.py
@@ -17,8 +17,6 @@ import numpy as np
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid import Program, program_guard
-from op_test import OpTest
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_max_op.py b/python/paddle/fluid/tests/unittests/test_max_op.py
index 844374b641ba34100bd8a9f5b7c4d797457c4b90..cf52cdb8d47891b1dc6c0320835a23cb8af6a119 100644
--- a/python/paddle/fluid/tests/unittests/test_max_op.py
+++ b/python/paddle/fluid/tests/unittests/test_max_op.py
@@ -12,15 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import unittest
-import tempfile
 import numpy as np
-from op_test import OpTest, skip_check_grad_ci, check_out_dtype
+from op_test import check_out_dtype
 import paddle
 from paddle.fluid.framework import _test_eager_guard
 import paddle.fluid.core as core
-import paddle.inference as paddle_infer
 from test_sum_op import TestReduceOPTensorAxisBase
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_mean_iou.py b/python/paddle/fluid/tests/unittests/test_mean_iou.py
index e334d881c8b024d5dcdd2c41468487ac4cab36c1..d55d1507f963e7d387ed5cf722ed0c0097c44384 100644
--- a/python/paddle/fluid/tests/unittests/test_mean_iou.py
+++ b/python/paddle/fluid/tests/unittests/test_mean_iou.py
@@ -16,7 +16,6 @@ import unittest
 import numpy as np
 from op_test import OpTest
 import paddle.fluid as fluid
-import paddle
 
 
 def compute_mean_iou(predictions, labels, num_classes, in_wrongs, in_corrects,
diff --git a/python/paddle/fluid/tests/unittests/test_mean_op.py b/python/paddle/fluid/tests/unittests/test_mean_op.py
index f7ca51dbd69255295ce1d0436726de54503687c4..6ba980879a6c91fd25f7a09495b2d5d319a61dc9 100644
--- a/python/paddle/fluid/tests/unittests/test_mean_op.py
+++ b/python/paddle/fluid/tests/unittests/test_mean_op.py
@@ -19,7 +19,6 @@ import paddle
 import paddle.fluid.core as core
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
-from paddle.fluid.framework import _test_eager_guard
 from test_sum_op import TestReduceOPTensorAxisBase
 import gradient_checker
 from decorator_helper import prog_scope
diff --git a/python/paddle/fluid/tests/unittests/test_memcpy_op.py b/python/paddle/fluid/tests/unittests/test_memcpy_op.py
index 9288cbda2bc824c32452f9c846fca4fbee263de0..8ab07ad9583eff66ddacc9f327acec8e7cdd5df4 100755
--- a/python/paddle/fluid/tests/unittests/test_memcpy_op.py
+++ b/python/paddle/fluid/tests/unittests/test_memcpy_op.py
@@ -12,15 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import op_test
 import numpy as np
 import unittest
 import paddle
 import paddle.fluid.core as core
-from paddle.fluid.op import Operator
 import paddle.fluid as fluid
-from paddle.fluid import compiler, Program, program_guard
-from paddle.fluid.backward import append_backward
+from paddle.fluid import Program, program_guard
 
 
 class TestMemcpy_FillConstant(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_meshgrid_op.py b/python/paddle/fluid/tests/unittests/test_meshgrid_op.py
index df8a85792e039509acef415b28ed42d093173a55..f49ac0d1d5279572d010b02a9dfbc27091a12df5 100644
--- a/python/paddle/fluid/tests/unittests/test_meshgrid_op.py
+++ b/python/paddle/fluid/tests/unittests/test_meshgrid_op.py
@@ -14,10 +14,9 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest, skip_check_grad_ci
+from op_test import OpTest
 import paddle.fluid as fluid
 import paddle
-from paddle.fluid import compiler, Program, program_guard, core
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_min_op.py b/python/paddle/fluid/tests/unittests/test_min_op.py
index b2554040984b2ff7537bcdd0307370f55385d00b..1f4cd926241381d3d30733ab60093b7252cf4b54 100644
--- a/python/paddle/fluid/tests/unittests/test_min_op.py
+++ b/python/paddle/fluid/tests/unittests/test_min_op.py
@@ -12,15 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import unittest
-import tempfile
 import numpy as np
-from op_test import OpTest, skip_check_grad_ci, check_out_dtype
+from op_test import check_out_dtype
 import paddle
 import paddle.fluid.core as core
 from paddle.fluid.framework import _test_eager_guard
-import paddle.inference as paddle_infer
 from test_sum_op import TestReduceOPTensorAxisBase
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_mine_hard_examples_op.py b/python/paddle/fluid/tests/unittests/test_mine_hard_examples_op.py
index 0e9e8f084c3d34dc7a276c2f80f49d37888ae527..67329652726a1f1510d085f80d62f25c835e00d0 100644
--- a/python/paddle/fluid/tests/unittests/test_mine_hard_examples_op.py
+++ b/python/paddle/fluid/tests/unittests/test_mine_hard_examples_op.py
@@ -14,8 +14,6 @@
 
 import unittest
 import numpy as np
-import sys
-import math
 from op_test import OpTest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_mix_precision_all_reduce_fuse.py b/python/paddle/fluid/tests/unittests/test_mix_precision_all_reduce_fuse.py
index be3ac17f66c29ef9f075c451d3e689b3991c8163..bc57d38b77c5a5e8b9f83024e54571578975ef23 100644
--- a/python/paddle/fluid/tests/unittests/test_mix_precision_all_reduce_fuse.py
+++ b/python/paddle/fluid/tests/unittests/test_mix_precision_all_reduce_fuse.py
@@ -13,9 +13,6 @@
 # limitations under the License.
 
 import paddle.fluid.core as core
-import math
-import os
-import sys
 import unittest
 
 import numpy as np
diff --git a/python/paddle/fluid/tests/unittests/test_modelaverage.py b/python/paddle/fluid/tests/unittests/test_modelaverage.py
index 86beb42a5631031ffd19fa1871fd7d4532b61575..474fa692b476b678f00263ee1281b2fcb5a5d6b6 100644
--- a/python/paddle/fluid/tests/unittests/test_modelaverage.py
+++ b/python/paddle/fluid/tests/unittests/test_modelaverage.py
@@ -14,9 +14,6 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest
-from paddle.fluid import core
-from paddle.fluid.op import Operator
 import paddle.fluid as fluid
 import paddle
 import paddle.nn as nn
diff --git a/python/paddle/fluid/tests/unittests/test_monitor.py b/python/paddle/fluid/tests/unittests/test_monitor.py
index 2eecacc5fa0e860933463113326ae904cc858b9f..8649f11821eb663aa13f91a3f7de3761d4510d37 100644
--- a/python/paddle/fluid/tests/unittests/test_monitor.py
+++ b/python/paddle/fluid/tests/unittests/test_monitor.py
@@ -21,7 +21,6 @@ paddle.enable_static()
 
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import numpy as np
 import os
 import unittest
 import tempfile
diff --git a/python/paddle/fluid/tests/unittests/test_mul_op.py b/python/paddle/fluid/tests/unittests/test_mul_op.py
index 892e0dd98e35fa3610a41dd3b016045610fa9c8d..0236f34ea8bf92f3b3eb092c5b79ddc618eb1ddf 100644
--- a/python/paddle/fluid/tests/unittests/test_mul_op.py
+++ b/python/paddle/fluid/tests/unittests/test_mul_op.py
@@ -14,7 +14,6 @@
 
 import unittest
 import numpy as np
-import paddle
 import paddle.fluid.core as core
 import sys
 
diff --git a/python/paddle/fluid/tests/unittests/test_multi_dot_op.py b/python/paddle/fluid/tests/unittests/test_multi_dot_op.py
index 8e58aeb2c1e92b82b46a61bd904e0b1bfb9fb621..ce188cac5c7d2333b74466aa79b54974ae832561 100644
--- a/python/paddle/fluid/tests/unittests/test_multi_dot_op.py
+++ b/python/paddle/fluid/tests/unittests/test_multi_dot_op.py
@@ -14,7 +14,7 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest, skip_check_grad_ci
+from op_test import OpTest
 from numpy.linalg import multi_dot
 from op_test import OpTest
 import paddle
diff --git a/python/paddle/fluid/tests/unittests/test_multinomial_op.py b/python/paddle/fluid/tests/unittests/test_multinomial_op.py
index 71e6cca29070e7feb81548631e8db861e10d5e00..5df70185dda588a7d95c2687163912d154ce34cb 100644
--- a/python/paddle/fluid/tests/unittests/test_multinomial_op.py
+++ b/python/paddle/fluid/tests/unittests/test_multinomial_op.py
@@ -15,7 +15,6 @@
 import unittest
 import paddle
 import paddle.fluid as fluid
-from paddle.fluid import core
 from op_test import OpTest
 import numpy as np
 import os
diff --git a/python/paddle/fluid/tests/unittests/test_multiply.py b/python/paddle/fluid/tests/unittests/test_multiply.py
index 55d17f71567f12a9daaf5d6d29cf952f3cb2e6cc..e32245990a847267a2332b6b31eef370f8182bf9 100755
--- a/python/paddle/fluid/tests/unittests/test_multiply.py
+++ b/python/paddle/fluid/tests/unittests/test_multiply.py
@@ -19,7 +19,7 @@ import numpy as np
 import paddle
 import paddle.tensor as tensor
 from paddle.static import Program, program_guard
-from paddle.fluid.framework import _test_eager_guard, in_dygraph_mode
+from paddle.fluid.framework import _test_eager_guard
 
 
 class TestMultiplyApi(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_dataset.py b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_dataset.py
index 1ecddc6268c9da5389c19b37d05cde19743d1979..4cf28bbd30b19e05a61394747636f1810d406899 100755
--- a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_dataset.py
+++ b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_dataset.py
@@ -18,8 +18,8 @@ import numpy as np
 import paddle
 import paddle.fluid as fluid
 from paddle.io import Dataset, IterableDataset, TensorDataset, \
-        ComposeDataset, ChainDataset, DataLoader, random_split, Subset
-from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph
+        ComposeDataset, ChainDataset, DataLoader
+from paddle.fluid.framework import _test_eager_guard
 
 IMAGE_SIZE = 32
 
diff --git a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_dynamic.py b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_dynamic.py
index 419e769b9335e2a2db1f810dc4eb7e74cc7749b6..32e562773665655c4ed2ba1748296b46defa8fbc 100644
--- a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_dynamic.py
+++ b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_dynamic.py
@@ -12,18 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import sys
 import six
 import time
 import unittest
-import multiprocessing
 import numpy as np
 
 import paddle.fluid as fluid
-from paddle.io import Dataset, BatchSampler, DataLoader
+from paddle.io import DataLoader
 from paddle.fluid.dygraph.nn import Linear
-from paddle.fluid.dygraph.base import to_variable
 
 from test_multiprocess_dataloader_static import RandomDataset, RandomBatchedDataset, prepare_places
 from test_multiprocess_dataloader_static import EPOCH_NUM, BATCH_SIZE, IMAGE_SIZE, SAMPLE_NUM, CLASS_NUM
diff --git a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_exception.py b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_exception.py
index 096c6ce542f7f8287ba526937869d53d271909cc..ea4b9363bfce2271a236a439f6df2d7fb7cd46d8 100644
--- a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_exception.py
+++ b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_exception.py
@@ -12,10 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
-import sys
-import six
-import time
 import unittest
 import multiprocessing
 import numpy as np
@@ -23,8 +19,6 @@ import numpy as np
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 from paddle.io import Dataset, IterableDataset, BatchSampler, DataLoader
-from paddle.fluid.dygraph.nn import Linear
-from paddle.fluid.dygraph.base import to_variable
 from paddle.fluid.dataloader.dataloader_iter import _worker_loop
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_dynamic.py b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_dynamic.py
index 4ca1480c6391404c00105c8e2b6df521bf003e15..09a1f6520ab96ad6ef002b0a0499765edd2436a3 100644
--- a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_dynamic.py
+++ b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_dynamic.py
@@ -12,18 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import sys
 import six
 import time
 import unittest
-import multiprocessing
 import numpy as np
 
 import paddle.fluid as fluid
-from paddle.io import Dataset, BatchSampler, DataLoader
+from paddle.io import DataLoader
 from paddle.fluid.dygraph.nn import Linear
-from paddle.fluid.dygraph.base import to_variable
 
 from test_multiprocess_dataloader_iterable_dataset_static import RandomDataset, RandomBatchedDataset, prepare_places
 from test_multiprocess_dataloader_iterable_dataset_static import EPOCH_NUM, BATCH_SIZE, IMAGE_SIZE, SAMPLE_NUM, CLASS_NUM
diff --git a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_split.py b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_split.py
index bf7a7bdd5d54cd50ca075216a6b6ceda3f6e414f..aef0c8c7d0812a9f74be42d8db611aafcd8c880d 100644
--- a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_split.py
+++ b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_split.py
@@ -17,7 +17,7 @@ import unittest
 import numpy as np
 
 import paddle.fluid as fluid
-from paddle.io import IterableDataset, BatchSampler, DataLoader, get_worker_info
+from paddle.io import DataLoader, IterableDataset, get_worker_info
 
 
 class RangeIterableDatasetSplit(IterableDataset):
diff --git a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_static.py b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_static.py
index 74fb23d84b61e85ad0a43628cbfd0878def5c191..b84530ccc41d7f152b79cfedf59062940177b620 100644
--- a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_static.py
+++ b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_iterable_dataset_static.py
@@ -12,16 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import sys
 import six
 import time
 import unittest
-import multiprocessing
 import numpy as np
 
 import paddle.fluid as fluid
-from paddle.io import IterableDataset, BatchSampler, DataLoader, get_worker_info
+from paddle.io import DataLoader, IterableDataset
 
 EPOCH_NUM = 2
 BATCH_SIZE = 8
diff --git a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_static.py b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_static.py
index d5706ab618dae0de347759d4c4fe2be2577d2905..dc9444f2f5fe2bde61384cb65e958efb6b11a9ee 100644
--- a/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_static.py
+++ b/python/paddle/fluid/tests/unittests/test_multiprocess_dataloader_static.py
@@ -12,17 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import sys
 import six
 import time
 import unittest
-import multiprocessing
 import numpy as np
 
 import paddle
 import paddle.fluid as fluid
-from paddle.io import Dataset, BatchSampler, DataLoader
+from paddle.io import DataLoader, Dataset
 
 EPOCH_NUM = 3
 BATCH_SIZE = 8
diff --git a/python/paddle/fluid/tests/unittests/test_multiprocess_reader_exception.py b/python/paddle/fluid/tests/unittests/test_multiprocess_reader_exception.py
index 825a6b8fa49e1def74e272f716fe401908fd0ffd..e1033ae881e81cbbb2f7b118f8d5a1707189defc 100644
--- a/python/paddle/fluid/tests/unittests/test_multiprocess_reader_exception.py
+++ b/python/paddle/fluid/tests/unittests/test_multiprocess_reader_exception.py
@@ -17,8 +17,6 @@ import paddle.fluid as fluid
 from paddle.reader import multiprocess_reader
 import unittest
 import numpy as np
-import six
-import sys
 
 
 class ReaderException(Exception):
diff --git a/python/paddle/fluid/tests/unittests/test_mv_op.py b/python/paddle/fluid/tests/unittests/test_mv_op.py
index 31ef652c3c408229c6ce960c29b18d5553430007..fbfd18a4778017f0cf293e7d479898dcc8e850ed 100644
--- a/python/paddle/fluid/tests/unittests/test_mv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_mv_op.py
@@ -15,9 +15,6 @@
 import unittest
 import numpy as np
 import paddle
-import paddle.fluid as fluid
-import paddle.fluid.layers as layers
-import paddle.fluid.core as core
 from paddle.static import program_guard, Program
 from op_test import OpTest
 
diff --git a/python/paddle/fluid/tests/unittests/test_nanmean_api.py b/python/paddle/fluid/tests/unittests/test_nanmean_api.py
index 60a77b47c48c87a9915f1277490caf727b677bc0..3155140518de5e62846d3cf02d151e066bd5de87 100644
--- a/python/paddle/fluid/tests/unittests/test_nanmean_api.py
+++ b/python/paddle/fluid/tests/unittests/test_nanmean_api.py
@@ -15,9 +15,7 @@
 import unittest
 import numpy as np
 import paddle
-import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid import Program, program_guard
 
 np.random.seed(10)
 
diff --git a/python/paddle/fluid/tests/unittests/test_nansum_api.py b/python/paddle/fluid/tests/unittests/test_nansum_api.py
index fc69296021365f21b7d9605dd5bfc4aef281bfa2..c0fe5da0cbccb8d3ae6466ebfa8d7209773768ce 100644
--- a/python/paddle/fluid/tests/unittests/test_nansum_api.py
+++ b/python/paddle/fluid/tests/unittests/test_nansum_api.py
@@ -16,8 +16,6 @@ import unittest
 import numpy as np
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.core as core
-from paddle.fluid import Program, program_guard
 
 
 class API_Test_Nansum(unittest.TestCase):
diff --git a/python/paddle/fluid/tests/unittests/test_nearest_interp_v2_op.py b/python/paddle/fluid/tests/unittests/test_nearest_interp_v2_op.py
index f8fbca4516918e506d8fedb8936e88f33c13c5f1..c3157a6e9a155f2f49db8bb4535b7fa30aa61f9e 100755
--- a/python/paddle/fluid/tests/unittests/test_nearest_interp_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_nearest_interp_v2_op.py
@@ -17,7 +17,6 @@ import numpy as np
 from op_test import OpTest
 import paddle.fluid.core as core
 import paddle.fluid as fluid
-import paddle.nn as nn
 import paddle
 from paddle.nn.functional import interpolate
 
diff --git a/python/paddle/fluid/tests/unittests/test_network_with_dtype.py b/python/paddle/fluid/tests/unittests/test_network_with_dtype.py
index f4015e225182b9de1339ed4ed5c3d4275c709b0a..203dcdc38cb2719f6c8cd376b9396e6d0f63a311 100644
--- a/python/paddle/fluid/tests/unittests/test_network_with_dtype.py
+++ b/python/paddle/fluid/tests/unittests/test_network_with_dtype.py
@@ -14,11 +14,9 @@
 
 import unittest
 
-import numpy as np
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.executor import Executor
 
 BATCH_SIZE = 20
 
diff --git a/python/paddle/fluid/tests/unittests/test_nn_functional_embedding_dygraph.py b/python/paddle/fluid/tests/unittests/test_nn_functional_embedding_dygraph.py
index 128d50f155463df12a58f3b10837b0a16e417fe9..d658fcec836dbf687158e04159a12e2a644c7d3a 100644
--- a/python/paddle/fluid/tests/unittests/test_nn_functional_embedding_dygraph.py
+++ b/python/paddle/fluid/tests/unittests/test_nn_functional_embedding_dygraph.py
@@ -15,7 +15,6 @@
 import unittest
 
 import paddle
-import paddle.nn as nn
 import numpy as np
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_nn_functional_hot_op.py b/python/paddle/fluid/tests/unittests/test_nn_functional_hot_op.py
index e8adf3850a84b1527a9c8c6d314004bb96ac5a51..27a7af94485203d05418d28b9e135605245e118b 100644
--- a/python/paddle/fluid/tests/unittests/test_nn_functional_hot_op.py
+++ b/python/paddle/fluid/tests/unittests/test_nn_functional_hot_op.py
@@ -14,13 +14,11 @@
 
 import unittest
 import numpy as np
-import math
 from op_test import OpTest
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 import paddle.nn.functional as functional
-import paddle.fluid.framework as framework
 from paddle.fluid.framework import Program, program_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_nn_matmul_v2_grad.py b/python/paddle/fluid/tests/unittests/test_nn_matmul_v2_grad.py
index f8542c003985900aa9247c015d19c98888a1a248..567ac1404c66954b913ee38b56fe0a7024c0efa2 100644
--- a/python/paddle/fluid/tests/unittests/test_nn_matmul_v2_grad.py
+++ b/python/paddle/fluid/tests/unittests/test_nn_matmul_v2_grad.py
@@ -17,7 +17,6 @@ import numpy as np
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
 import gradient_checker
 from decorator_helper import prog_scope
diff --git a/python/paddle/fluid/tests/unittests/test_nn_sigmoid_op.py b/python/paddle/fluid/tests/unittests/test_nn_sigmoid_op.py
index f71a6c6afc674ff99502631e1dc78db07d885d04..7af7b96c999b6455153d6ca6765a325188ad9ac7 100644
--- a/python/paddle/fluid/tests/unittests/test_nn_sigmoid_op.py
+++ b/python/paddle/fluid/tests/unittests/test_nn_sigmoid_op.py
@@ -16,8 +16,6 @@ import unittest
 import numpy as np
 import paddle
 import paddle.fluid.core as core
-from op_test import OpTest
-from scipy.special import expit, erf
 import paddle
 import paddle.fluid as fluid
 import paddle.nn as nn
diff --git a/python/paddle/fluid/tests/unittests/test_nonzero_api.py b/python/paddle/fluid/tests/unittests/test_nonzero_api.py
index a3c79600941bf75a6a00ef8dbb294ec7068dfc35..cd4d227e823b95a3e1d8e8056862efaf6735ef6f 100644
--- a/python/paddle/fluid/tests/unittests/test_nonzero_api.py
+++ b/python/paddle/fluid/tests/unittests/test_nonzero_api.py
@@ -14,7 +14,6 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest
 import paddle
 import paddle.fluid as fluid
 from paddle.fluid import Program, program_guard
diff --git a/python/paddle/fluid/tests/unittests/test_normalize.py b/python/paddle/fluid/tests/unittests/test_normalize.py
index ad8fdebfbb7c3e949f92e8ca1f2b32ee5e5eeba8..bb8b4881d3f47bcec52dbf701ea951cefe826cad 100644
--- a/python/paddle/fluid/tests/unittests/test_normalize.py
+++ b/python/paddle/fluid/tests/unittests/test_normalize.py
@@ -16,7 +16,6 @@ import unittest
 import paddle
 import paddle.nn.functional as F
 import paddle.fluid as fluid
-import paddle.fluid.core as core
 import numpy as np
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_number_count_op.py b/python/paddle/fluid/tests/unittests/test_number_count_op.py
index 5fc82a976852448f533ef8da059150fae83d853a..58e24e6692ad321a51c1f52cfe623eba5b48170e 100644
--- a/python/paddle/fluid/tests/unittests/test_number_count_op.py
+++ b/python/paddle/fluid/tests/unittests/test_number_count_op.py
@@ -17,10 +17,6 @@ import numpy as np
 import unittest
 import paddle
 import paddle.fluid.core as core
-from paddle.fluid.op import Operator
-import paddle.fluid as fluid
-from paddle.fluid import compiler, Program, program_guard
-from paddle.fluid.backward import append_backward
 from paddle.distributed.models.moe import utils
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_numel_op.py b/python/paddle/fluid/tests/unittests/test_numel_op.py
index 2bdb8dde5a9efea0df7c51b66ede95313376932f..7bb76c531a31aa6e0e5b6e86b3368fc6c9a4d470 100644
--- a/python/paddle/fluid/tests/unittests/test_numel_op.py
+++ b/python/paddle/fluid/tests/unittests/test_numel_op.py
@@ -15,10 +15,7 @@
 import unittest
 import numpy as np
 from op_test import OpTest
-import paddle.fluid.core as core
 import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard
-import functools
 import paddle
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_one_hot_op.py b/python/paddle/fluid/tests/unittests/test_one_hot_op.py
index de6a4c051ea8d0bf5cfbea8f68ab4309ffce19fc..55abf26ea231e8fd52d10d673ab9246c01db5ae5 100644
--- a/python/paddle/fluid/tests/unittests/test_one_hot_op.py
+++ b/python/paddle/fluid/tests/unittests/test_one_hot_op.py
@@ -14,12 +14,10 @@
 
 import unittest
 import numpy as np
-import math
 from op_test import OpTest
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import paddle.fluid.framework as framework
 from paddle.fluid.framework import Program, program_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_one_hot_v2_op.py b/python/paddle/fluid/tests/unittests/test_one_hot_v2_op.py
index d10db304980ad77ce918a421cbedcf06284e92d3..284957a5318f14039b0c9c6735c7a8d50fe779b4 100644
--- a/python/paddle/fluid/tests/unittests/test_one_hot_v2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_one_hot_v2_op.py
@@ -14,12 +14,10 @@
 
 import unittest
 import numpy as np
-import math
 from op_test import OpTest
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-import paddle.fluid.framework as framework
 from paddle.fluid.framework import Program, program_guard, _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_ones_like.py b/python/paddle/fluid/tests/unittests/test_ones_like.py
index f8ad66fc0f116c3ba5c38559d3081af9f36fd431..8c0ceadbf581edbb71bd13b5ca7f251fd8dccc69 100644
--- a/python/paddle/fluid/tests/unittests/test_ones_like.py
+++ b/python/paddle/fluid/tests/unittests/test_ones_like.py
@@ -16,7 +16,7 @@ import unittest
 import numpy as np
 import paddle
 import paddle.fluid as fluid
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 from paddle import ones_like
 from paddle.fluid import core, Program, program_guard
 from paddle.fluid.framework import convert_np_dtype_to_dtype_
diff --git a/python/paddle/fluid/tests/unittests/test_ones_op.py b/python/paddle/fluid/tests/unittests/test_ones_op.py
index 79ca0648c948f4811f575ac0040ee6a85cf5c027..ac02627f9cc1a1bb8176a219d1d0edb99266a36e 100644
--- a/python/paddle/fluid/tests/unittests/test_ones_op.py
+++ b/python/paddle/fluid/tests/unittests/test_ones_op.py
@@ -14,11 +14,8 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest
 
 import paddle
-import paddle.fluid.core as core
-from paddle.fluid.op import Operator
 import paddle.fluid as fluid
 import numpy as np
 
diff --git a/python/paddle/fluid/tests/unittests/test_onnx_export.py b/python/paddle/fluid/tests/unittests/test_onnx_export.py
index cac464dc077b6f236e0063461728c4c87f7d39cf..6cb4ed2fd924e5f52e745d6a1260a8956675759b 100644
--- a/python/paddle/fluid/tests/unittests/test_onnx_export.py
+++ b/python/paddle/fluid/tests/unittests/test_onnx_export.py
@@ -12,14 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
-import pickle
 import unittest
 import numpy as np
 import paddle
-from paddle.static import InputSpec
 
-from paddle.fluid.framework import in_dygraph_mode, _test_eager_guard
+from paddle.fluid.framework import _test_eager_guard
 
 
 class LinearNet(paddle.nn.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_op_function_generator.py b/python/paddle/fluid/tests/unittests/test_op_function_generator.py
index 441e77b455cd08560a69507b3995796a6f85f83e..a8e4e7d3e8211c5c5edfc7da1a53cefa1b611b71 100644
--- a/python/paddle/fluid/tests/unittests/test_op_function_generator.py
+++ b/python/paddle/fluid/tests/unittests/test_op_function_generator.py
@@ -13,13 +13,12 @@
 # limitations under the License.
 
 import unittest
-from paddle.fluid.framework import default_main_program, Program, convert_np_dtype_to_dtype_, _non_static_mode, in_dygraph_mode
+from paddle.fluid.framework import in_dygraph_mode
 import paddle.fluid as fluid
 import paddle.fluid.layers as layers
-import paddle.fluid.core as core
 from paddle.fluid.dygraph.jit import TracedLayer
 import numpy as np
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 
 
 class TestTracedLayer(fluid.dygraph.Layer):
diff --git a/python/paddle/fluid/tests/unittests/test_outer.py b/python/paddle/fluid/tests/unittests/test_outer.py
index d6040c298f0c7cb47d0dbf5b3b327ae3852b822d..a887615f0f30658f68f069bcb7b57ee2dcaddfe8 100644
--- a/python/paddle/fluid/tests/unittests/test_outer.py
+++ b/python/paddle/fluid/tests/unittests/test_outer.py
@@ -18,7 +18,7 @@ import numpy as np
 
 import paddle
 from paddle.static import Program, program_guard
-from paddle.fluid.framework import _test_eager_guard, in_dygraph_mode
+from paddle.fluid.framework import _test_eager_guard
 
 
 class TestMultiplyApi(unittest.TestCase):