diff --git a/python/paddle/fluid/tests/unittests/test_unbind_op.py b/python/paddle/fluid/tests/unittests/test_unbind_op.py
index 8634ef5f3ce8e2ab0711566bd8b1150b81879122..e030792ce6014dacb098dd713d378a55b2a4e051 100644
--- a/python/paddle/fluid/tests/unittests/test_unbind_op.py
+++ b/python/paddle/fluid/tests/unittests/test_unbind_op.py
@@ -18,7 +18,7 @@ from op_test import OpTest, convert_float_to_uint16
 import paddle
 import paddle.fluid as fluid
 import paddle.tensor as tensor
-from paddle.fluid import compiler, Program, program_guard, core
+from paddle.fluid import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_unfold_op.py b/python/paddle/fluid/tests/unittests/test_unfold_op.py
index 32e2adbfbf870da3e8c65849a8882eb98c43f9ce..ea38ae2be1cb205d2742973afe3dd310a88d88d8 100644
--- a/python/paddle/fluid/tests/unittests/test_unfold_op.py
+++ b/python/paddle/fluid/tests/unittests/test_unfold_op.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import math
 import numpy as np
 import unittest
 from op_test import OpTest
diff --git a/python/paddle/fluid/tests/unittests/test_uniform_random_bf16_op.py b/python/paddle/fluid/tests/unittests/test_uniform_random_bf16_op.py
index 464374782a96324bd4eff339d32866c78cb65263..77d9903cefff2a083b374adbe3781d960804eeeb 100644
--- a/python/paddle/fluid/tests/unittests/test_uniform_random_bf16_op.py
+++ b/python/paddle/fluid/tests/unittests/test_uniform_random_bf16_op.py
@@ -14,12 +14,11 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest, convert_uint16_to_float, convert_float_to_uint16
+from op_test import OpTest, convert_uint16_to_float
 import paddle
 import paddle.fluid.core as core
 from paddle.fluid.op import Operator
 import paddle.fluid as fluid
-from paddle.fluid import Program, program_guard
 from paddle.fluid.tests.unittests.test_uniform_random_op import output_hist, output_hist_diag
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_uniform_random_op.py b/python/paddle/fluid/tests/unittests/test_uniform_random_op.py
index 4ffcd1904440640d9c68e3d59e870a9d067bae25..eb72beed2c8ed1aa4fd7897f9cd2e06761e904fc 100644
--- a/python/paddle/fluid/tests/unittests/test_uniform_random_op.py
+++ b/python/paddle/fluid/tests/unittests/test_uniform_random_op.py
@@ -12,9 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys
 import os
-import subprocess
 import unittest
 import numpy as np
 from op_test import OpTest
diff --git a/python/paddle/fluid/tests/unittests/test_unique.py b/python/paddle/fluid/tests/unittests/test_unique.py
index 48e121f1bc3a00ee08e249a392668a89498f01d9..a62f5e2808d9f833755de17386602507fd7e76e3 100644
--- a/python/paddle/fluid/tests/unittests/test_unique.py
+++ b/python/paddle/fluid/tests/unittests/test_unique.py
@@ -18,7 +18,6 @@ from op_test import OpTest
 import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.op import Operator
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_unique_consecutive_op.py b/python/paddle/fluid/tests/unittests/test_unique_consecutive_op.py
index b645eb78ba46497b88aaf740038041ba27838583..91a8c6d6a4bf3edcdbf816c632713b999364aebc 100644
--- a/python/paddle/fluid/tests/unittests/test_unique_consecutive_op.py
+++ b/python/paddle/fluid/tests/unittests/test_unique_consecutive_op.py
@@ -19,7 +19,6 @@ import paddle.fluid.core as core
 
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.framework as framework
 
 
 def reference_unique_consecutive(X, return_inverse=False, return_counts=False):
diff --git a/python/paddle/fluid/tests/unittests/test_unique_with_counts.py b/python/paddle/fluid/tests/unittests/test_unique_with_counts.py
index 95191fc110e439d126a24114ffcbe832ab3c5d93..30fc203d933fbc063de1b6ece070a3878eb2c25e 100644
--- a/python/paddle/fluid/tests/unittests/test_unique_with_counts.py
+++ b/python/paddle/fluid/tests/unittests/test_unique_with_counts.py
@@ -17,7 +17,6 @@ import numpy as np
 from op_test import OpTest
 import paddle.fluid as fluid
 import paddle.fluid.core as core
-from paddle.fluid.op import Operator
 
 
 class TestUniqueWithCountsOp(OpTest):
diff --git a/python/paddle/fluid/tests/unittests/test_unpool1d_op.py b/python/paddle/fluid/tests/unittests/test_unpool1d_op.py
index 68949d0ef9eda578d4b5931ff781d1d694e2650a..f15d295ce9ebc70b26da2bca5042587b4b9bc797 100644
--- a/python/paddle/fluid/tests/unittests/test_unpool1d_op.py
+++ b/python/paddle/fluid/tests/unittests/test_unpool1d_op.py
@@ -14,7 +14,6 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest
 import paddle
 import paddle.nn.functional as F
 
diff --git a/python/paddle/fluid/tests/unittests/test_unpool_op.py b/python/paddle/fluid/tests/unittests/test_unpool_op.py
index 234714923e817aa54df6ca44a82edd15fc53a62b..7c59d628e81b2be9be01a0b1fae3c4880b518c3c 100644
--- a/python/paddle/fluid/tests/unittests/test_unpool_op.py
+++ b/python/paddle/fluid/tests/unittests/test_unpool_op.py
@@ -288,7 +288,6 @@ class TestUnpoolOpAPI_dy3(unittest.TestCase):
 
     def test_case(self):
         import paddle
-        import paddle.nn.functional as F
         import paddle.fluid.core as core
         import paddle.fluid as fluid
         import numpy as np
diff --git a/python/paddle/fluid/tests/unittests/test_var_info.py b/python/paddle/fluid/tests/unittests/test_var_info.py
index 5056d83bffa237d4f72daa4457f3c4ff93aeebc6..7af77ae96b55196650fc8b19c1f40b84df4c56dc 100644
--- a/python/paddle/fluid/tests/unittests/test_var_info.py
+++ b/python/paddle/fluid/tests/unittests/test_var_info.py
@@ -18,8 +18,6 @@ including create, config, run, etc.
 
 import paddle.fluid as fluid
 import numpy as np
-import os
-import shutil
 import unittest
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_variable.py b/python/paddle/fluid/tests/unittests/test_variable.py
index efcdb6232ebe3cb2e2584690e3fbd1c6bbe2c4d7..8ab9d14c924dbd0179a79d563a9adae3acb27fd9 100644
--- a/python/paddle/fluid/tests/unittests/test_variable.py
+++ b/python/paddle/fluid/tests/unittests/test_variable.py
@@ -16,10 +16,9 @@ import unittest
 from functools import reduce
 
 import paddle
-from paddle.fluid.framework import default_main_program, Program, convert_np_dtype_to_dtype_, _non_static_mode
+from paddle.fluid.framework import Program, convert_np_dtype_to_dtype_, default_main_program
 import paddle
 import paddle.fluid as fluid
-import paddle.fluid.layers as layers
 import paddle.fluid.core as core
 import numpy as np
 
diff --git a/python/paddle/fluid/tests/unittests/test_view_op_reuse_allocation.py b/python/paddle/fluid/tests/unittests/test_view_op_reuse_allocation.py
index 70778e42b7c24fd06de212fcf584f5eb869bde46..1f4725568a810d7b5fe37519a31c55aff58014e9 100644
--- a/python/paddle/fluid/tests/unittests/test_view_op_reuse_allocation.py
+++ b/python/paddle/fluid/tests/unittests/test_view_op_reuse_allocation.py
@@ -16,9 +16,8 @@ import unittest
 
 import numpy as np
 
-from op_test import OpTest
 import paddle
-from paddle.fluid.framework import _test_eager_guard, in_dygraph_mode
+from paddle.fluid.framework import _test_eager_guard
 
 
 # NOTE(pangyoki): Tensor View Strategy.
diff --git a/python/paddle/fluid/tests/unittests/test_where_op.py b/python/paddle/fluid/tests/unittests/test_where_op.py
index d946527ea2a8a58ea3c39e885115f091e3887bf2..fafa4e527914262f408b7d24539a628ee9853a3a 100644
--- a/python/paddle/fluid/tests/unittests/test_where_op.py
+++ b/python/paddle/fluid/tests/unittests/test_where_op.py
@@ -16,11 +16,8 @@ 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
-from paddle.fluid import compiler, Program, program_guard
-from paddle.fluid.op import Operator
+from paddle.fluid import Program, program_guard
 from paddle.fluid.backward import append_backward
 from paddle.fluid.framework import _test_eager_guard
 
diff --git a/python/paddle/fluid/tests/unittests/test_while_loop_op.py b/python/paddle/fluid/tests/unittests/test_while_loop_op.py
index 93997eeb0927550c1a79d6567fbaabda911aacc8..7d5fc61f28badff2a9275923b884007b8d9fbff4 100644
--- a/python/paddle/fluid/tests/unittests/test_while_loop_op.py
+++ b/python/paddle/fluid/tests/unittests/test_while_loop_op.py
@@ -19,8 +19,6 @@ import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 import paddle.fluid.layers as layers
-import paddle.fluid.framework as framework
-from paddle.fluid.executor import Executor
 from paddle.fluid.framework import Program, program_guard
 from paddle.fluid.backward import append_backward
 
diff --git a/python/paddle/fluid/tests/unittests/test_while_op.py b/python/paddle/fluid/tests/unittests/test_while_op.py
index 9f747328523525701c699e6f5f4bb271bb04267b..648e93dede8d0f9bb1dcbeed50d5ed43f7578f06 100644
--- a/python/paddle/fluid/tests/unittests/test_while_op.py
+++ b/python/paddle/fluid/tests/unittests/test_while_op.py
@@ -20,7 +20,6 @@ import paddle.fluid.core as core
 import paddle.fluid as fluid
 from paddle.fluid.backward import append_backward
 import numpy
-from paddle.fluid import compiler, Program, program_guard
 
 paddle.enable_static()
 
diff --git a/python/paddle/fluid/tests/unittests/test_yolo_box_op.py b/python/paddle/fluid/tests/unittests/test_yolo_box_op.py
index 754f476e13fa6bb28aed11e93e5b7493ac3a512c..0a4897b821d6698d2acf995c710fdb7f6b8dd480 100644
--- a/python/paddle/fluid/tests/unittests/test_yolo_box_op.py
+++ b/python/paddle/fluid/tests/unittests/test_yolo_box_op.py
@@ -16,7 +16,6 @@ import unittest
 import numpy as np
 from op_test import OpTest
 import paddle
-from paddle.fluid import core
 from paddle.fluid.framework import _test_eager_guard
 
 
diff --git a/python/paddle/fluid/tests/unittests/test_zeros_like_op.py b/python/paddle/fluid/tests/unittests/test_zeros_like_op.py
index 453022511cfd4202e2ae06cc72b45a8813e37995..0a86123ea2c16c780265fd0b8361a43f53531284 100644
--- a/python/paddle/fluid/tests/unittests/test_zeros_like_op.py
+++ b/python/paddle/fluid/tests/unittests/test_zeros_like_op.py
@@ -17,7 +17,7 @@ import numpy as np
 import paddle
 import paddle.fluid as fluid
 from paddle import zeros_like
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 from paddle.fluid import core, Program, program_guard
 from paddle.fluid.framework import _test_eager_guard
 from paddle.fluid.framework import convert_np_dtype_to_dtype_
diff --git a/python/paddle/fluid/tests/unittests/test_zeros_op.py b/python/paddle/fluid/tests/unittests/test_zeros_op.py
index 031439171d5fe86ae2fc2c42e30a33b06722232b..84d83d6a7b560b6ecca9ca299227607eb322f789 100644
--- a/python/paddle/fluid/tests/unittests/test_zeros_op.py
+++ b/python/paddle/fluid/tests/unittests/test_zeros_op.py
@@ -14,13 +14,10 @@
 
 import unittest
 import numpy as np
-from op_test import OpTest
 import paddle
 import paddle.compat as cpt
-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 import Program, program_guard
 from paddle.fluid.framework import _test_eager_guard