diff --git a/python/paddle/device/cuda/streams.py b/python/paddle/device/cuda/streams.py
index d25355056e8d546c8a556e5395ab781f042b199f..573750a862fafeaa93a877dbc0981e51582bd8fe 100644
--- a/python/paddle/device/cuda/streams.py
+++ b/python/paddle/device/cuda/streams.py
@@ -12,5 +12,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle.fluid.core import CUDAStream as Stream
-from paddle.fluid.core import CUDAEvent as Event
+from paddle.fluid.core import CUDAStream as Stream  # noqa: F401
+from paddle.fluid.core import CUDAEvent as Event  # noqa: F401
diff --git a/python/paddle/incubate/autograd/functional.py b/python/paddle/incubate/autograd/functional.py
index b96a4633c1e26482b52b81a77eef3e7a39f9abf4..dce83b7505fb208a22ca5595319929910f55ec65 100644
--- a/python/paddle/incubate/autograd/functional.py
+++ b/python/paddle/incubate/autograd/functional.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import functools
 import typing
 
 import paddle
diff --git a/python/paddle/incubate/autograd/primreg.py b/python/paddle/incubate/autograd/primreg.py
index 7972409d9356cd94196bd0420b592483d55b8f90..31f47f8196315ca971dd025ec7b547c47038fabf 100644
--- a/python/paddle/incubate/autograd/primreg.py
+++ b/python/paddle/incubate/autograd/primreg.py
@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import functools
-
 
 class Registry(object):
     """ A general registry object. """
diff --git a/python/paddle/incubate/autograd/primrules.py b/python/paddle/incubate/autograd/primrules.py
index 3be0816864f0f1a70f8bae08cbd6876bfe6561bb..601ed6b0a950b5762ff25c06cbb2a8a7013d0d5f 100644
--- a/python/paddle/incubate/autograd/primrules.py
+++ b/python/paddle/incubate/autograd/primrules.py
@@ -20,15 +20,15 @@ import paddle
 
 from . import primops
 from .primops import (add, broadcast, concat, cos, div, eq, erf, exp,
-                      fill_const, gather, ge, gt, log, matmul, max, mul, ne,
-                      neg, reduce_sum, reshape, scatter_add, select, set_value,
-                      sin, slice_assign, slice_select, split, sqrt, sub, tanh,
+                      fill_const, gather, ge, gt, log, matmul, mul, ne, neg,
+                      reduce_sum, reshape, scatter_add, select, set_value, sin,
+                      slice_assign, slice_select, split, sqrt, sub, tanh,
                       transpose, bernoulli, rsqrt)
 from .primreg import (REGISTER_JVP, REGISTER_ORIG2PRIM, REGISTER_PRIM2ORIG,
                       REGISTER_TRANSPOSE, lookup_fn, lookup_jvp,
                       lookup_orig2prim, lookup_prim2orig, lookup_transpose,
                       op_position_inputs, op_position_output)
-from .utils import INT_DTYPE_2_STRING, get_input_var_list, get_output_var_list
+from .utils import INT_DTYPE_2_STRING, get_output_var_list
 from paddle.fluid.data_feeder import convert_dtype
 from paddle.fluid.framework import convert_np_dtype_to_dtype_
 
diff --git a/python/paddle/incubate/distributed/models/moe/gate/gshard_gate.py b/python/paddle/incubate/distributed/models/moe/gate/gshard_gate.py
index 643e23feff164ce4e344f7e9bed0430e885130b5..4152dee3a37067ef81bccc58e9716fc642b36fc6 100644
--- a/python/paddle/incubate/distributed/models/moe/gate/gshard_gate.py
+++ b/python/paddle/incubate/distributed/models/moe/gate/gshard_gate.py
@@ -22,7 +22,6 @@
 import math
 import paddle
 import paddle.nn.functional as F
-import numpy as np
 from .naive_gate import NaiveGate
 from ..utils import limit_by_capacity
 
diff --git a/python/paddle/incubate/distributed/models/moe/gate/naive_gate.py b/python/paddle/incubate/distributed/models/moe/gate/naive_gate.py
index 476f99b9f4431ce5a3884a78ee07d4b8557fef7d..20001377fd1e1a5f7f13339f2f860d488f506af6 100644
--- a/python/paddle/incubate/distributed/models/moe/gate/naive_gate.py
+++ b/python/paddle/incubate/distributed/models/moe/gate/naive_gate.py
@@ -23,7 +23,6 @@ from .base_gate import BaseGate
 
 import paddle
 import paddle.nn as nn
-import paddle.nn.functional as F
 
 
 class NaiveGate(BaseGate):
diff --git a/python/paddle/incubate/distributed/models/moe/gate/switch_gate.py b/python/paddle/incubate/distributed/models/moe/gate/switch_gate.py
index 604751985406a5da6669583714acecd7281cc811..62e32e4db70d9a0d5bcc0c525aebdce4499b963a 100644
--- a/python/paddle/incubate/distributed/models/moe/gate/switch_gate.py
+++ b/python/paddle/incubate/distributed/models/moe/gate/switch_gate.py
@@ -21,7 +21,6 @@
 
 import math
 import paddle
-import paddle.nn as nn
 import paddle.nn.functional as F
 from .naive_gate import NaiveGate
 from ..utils import limit_by_capacity
diff --git a/python/paddle/incubate/distributed/models/moe/grad_clip.py b/python/paddle/incubate/distributed/models/moe/grad_clip.py
index 8d645d8fc05b6652160f38006f6699d4630b324e..91de68e4bfa0f14989864bad716b631e9e25257f 100644
--- a/python/paddle/incubate/distributed/models/moe/grad_clip.py
+++ b/python/paddle/incubate/distributed/models/moe/grad_clip.py
@@ -14,11 +14,8 @@
 
 from paddle.fluid.clip import ClipGradBase, _squared_l2_norm
 from paddle.fluid.dygraph import base as imperative_base
-from paddle.fluid import core, layers, framework
+from paddle.fluid import core, layers
 from paddle.distributed import collective
-import six
-import warnings
-import copy
 
 
 class ClipGradForMOEByGlobalNorm(ClipGradBase):
diff --git a/python/paddle/incubate/distributed/models/moe/moe_layer.py b/python/paddle/incubate/distributed/models/moe/moe_layer.py
index 7c11a3e6393cc7824de56fd6ba9e9f54715008e9..b2d11e7a317b99966df92d5efb8207cbafb20729 100644
--- a/python/paddle/incubate/distributed/models/moe/moe_layer.py
+++ b/python/paddle/incubate/distributed/models/moe/moe_layer.py
@@ -19,22 +19,14 @@
 #     Copyright 2021, Jiaao He. All rights reserved.
 #   Licensed under the Apache License, Version 2.0 (the "License").
 
-import collections
-import math
-
 import numpy as np
 import paddle
 import paddle.nn as nn
-import paddle.nn.functional as F
 from paddle.distributed.utils.moe_utils import global_scatter, global_gather
-from paddle.distributed import alltoall, all_gather
 
-from paddle.distributed.fleet.meta_parallel import get_rng_state_tracker
-from paddle.distributed import fleet
 from paddle.autograd import PyLayer
 from .gate import NaiveGate, GShardGate, SwitchGate, BaseGate
 from .utils import count_by_gate
-from paddle import fluid
 from paddle.fluid.framework import in_dygraph_mode
 from paddle.incubate.distributed.fleet import recompute_hybrid
 
diff --git a/python/paddle/incubate/multiprocessing/reductions.py b/python/paddle/incubate/multiprocessing/reductions.py
index 54d40312268aa1d0ca4019e8266a019e6e6a2833..c54626175bc7db047738f8199ee64e41c57fd7c6 100644
--- a/python/paddle/incubate/multiprocessing/reductions.py
+++ b/python/paddle/incubate/multiprocessing/reductions.py
@@ -17,13 +17,10 @@ import paddle
 # TODO: check the hooks of tensor
 # TODO: check serializing named tensor
 # TODO: check influence on autograd
-import os
 import sys
 import warnings
-import math
 import copy
 import threading
-import multiprocessing
 from multiprocessing.util import register_after_fork
 from multiprocessing.reduction import ForkingPickler
 
diff --git a/python/paddle/incubate/nn/functional/fused_matmul_bias.py b/python/paddle/incubate/nn/functional/fused_matmul_bias.py
index 6d55e31790f93025d611c6f60d835c2936049410..6c0722fc7061002aab9986f585f64fbb01b37a50 100644
--- a/python/paddle/incubate/nn/functional/fused_matmul_bias.py
+++ b/python/paddle/incubate/nn/functional/fused_matmul_bias.py
@@ -15,7 +15,7 @@
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.fluid.framework import _non_static_mode
 from paddle.tensor.linalg import matmul
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 
 
 def fused_matmul_bias(x,
diff --git a/python/paddle/incubate/nn/functional/fused_transformer.py b/python/paddle/incubate/nn/functional/fused_transformer.py
index 26ac7f349246e58a4e6cdf545e9e34b84d273ded..2eaa7ceadc71370411b0990d9c4c277618393cbc 100644
--- a/python/paddle/incubate/nn/functional/fused_transformer.py
+++ b/python/paddle/incubate/nn/functional/fused_transformer.py
@@ -15,8 +15,8 @@
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.fluid.framework import _non_static_mode, default_main_program
 from paddle.fluid.data_feeder import check_variable_and_dtype, check_dtype
-from paddle.fluid import core, dygraph_utils
-from paddle import _C_ops, _legacy_C_ops
+from paddle.fluid import core
+from paddle import _legacy_C_ops
 
 __all__ = []
 
diff --git a/python/paddle/incubate/nn/layer/fused_transformer.py b/python/paddle/incubate/nn/layer/fused_transformer.py
index fefef4f37c7fd0a4e69662dd1c4cbf8d0efc2f04..f9cb7da823181b261b5ae19579758ac23422e053 100644
--- a/python/paddle/incubate/nn/layer/fused_transformer.py
+++ b/python/paddle/incubate/nn/layer/fused_transformer.py
@@ -11,10 +11,8 @@
 # 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 paddle.nn import functional as F
 from paddle.incubate.nn import functional as incubate_f
 from paddle.nn import Layer
-from paddle.framework import ParamAttr
 import paddle
 from paddle.nn.layer.transformer import _convert_attention_mask, _convert_param_attr_to_list
 from paddle.nn.initializer import Constant
diff --git a/python/paddle/incubate/operators/graph_khop_sampler.py b/python/paddle/incubate/operators/graph_khop_sampler.py
index 11c9a9853bf4463ec781f1a3f1d4491dd6cd9138..2122383381358e7f8fed0fa354a136a10da208e0 100644
--- a/python/paddle/incubate/operators/graph_khop_sampler.py
+++ b/python/paddle/incubate/operators/graph_khop_sampler.py
@@ -12,12 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.fluid.framework import _non_static_mode
 from paddle.fluid.data_feeder import check_variable_and_dtype
-from paddle.fluid import core
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 
 
 def graph_khop_sampler(row,
diff --git a/python/paddle/incubate/operators/graph_reindex.py b/python/paddle/incubate/operators/graph_reindex.py
index fee9b170c1a5bd5bcb5ac0f687a40c379a0613f7..d8f67741908019e38326cc1f82ea29b7244ff0f0 100644
--- a/python/paddle/incubate/operators/graph_reindex.py
+++ b/python/paddle/incubate/operators/graph_reindex.py
@@ -12,12 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.fluid.framework import _non_static_mode
 from paddle.fluid.data_feeder import check_variable_and_dtype
-from paddle.fluid import core
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 import paddle.utils.deprecated as deprecated
 
 
diff --git a/python/paddle/incubate/operators/graph_sample_neighbors.py b/python/paddle/incubate/operators/graph_sample_neighbors.py
index 8b0d6158b2917cae5b6a502bc9619ad530db3b6c..b39910f9e1126b5035c90123f73ce4ef1331d82e 100644
--- a/python/paddle/incubate/operators/graph_sample_neighbors.py
+++ b/python/paddle/incubate/operators/graph_sample_neighbors.py
@@ -12,12 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.fluid.framework import _non_static_mode
 from paddle.fluid.data_feeder import check_variable_and_dtype
-from paddle.fluid import core
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 import paddle.utils.deprecated as deprecated
 
 
diff --git a/python/paddle/incubate/operators/graph_send_recv.py b/python/paddle/incubate/operators/graph_send_recv.py
index 91ea337eeb2debf283fe672a4106eb81db607c30..939d8c343fd5c25a61727e59a8b91eb31dc97176 100644
--- a/python/paddle/incubate/operators/graph_send_recv.py
+++ b/python/paddle/incubate/operators/graph_send_recv.py
@@ -14,7 +14,7 @@
 
 import numpy as np
 from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid.framework import _non_static_mode, _in_legacy_dygraph, in_dygraph_mode
+from paddle.fluid.framework import _in_legacy_dygraph, in_dygraph_mode
 from paddle.fluid.framework import Variable
 from paddle.fluid.data_feeder import check_variable_and_dtype, check_type, check_dtype, convert_dtype
 from paddle.fluid.layers.tensor import cast
diff --git a/python/paddle/incubate/operators/resnet_unit.py b/python/paddle/incubate/operators/resnet_unit.py
index 2f4cb4d3bde90c6a9438f8fd949afdcce2598f02..c8fb583bff4b6dfb91738b5d7aa41e791fb67dbe 100644
--- a/python/paddle/incubate/operators/resnet_unit.py
+++ b/python/paddle/incubate/operators/resnet_unit.py
@@ -12,28 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import copy
-import collections
-import itertools
-import six
-import math
-import sys
-import warnings
-from functools import partial, reduce
-
 import numpy as np
-import paddle
 import paddle.fluid as fluid
-from paddle import framework
-from paddle.device import get_device, get_cudnn_version
 from paddle.nn import initializer as I
-from paddle.nn import Layer, LayerList
+from paddle.nn import Layer
 from paddle.fluid.layers import utils
 from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid.layers.utils import map_structure, flatten, pack_sequence_as
-from paddle.fluid.data_feeder import convert_dtype
 from paddle.fluid.param_attr import ParamAttr
-from paddle import _C_ops, _legacy_C_ops
 
 
 def resnet_unit(x, filter_x, scale_x, bias_x, mean_x, var_x, z, filter_z,
diff --git a/python/paddle/incubate/operators/softmax_mask_fuse.py b/python/paddle/incubate/operators/softmax_mask_fuse.py
index 4fc733ab4a8d63c894ade6b8c610ff21405e1041..27afabaa0db6bbad578509b0e98dce1da83584bd 100644
--- a/python/paddle/incubate/operators/softmax_mask_fuse.py
+++ b/python/paddle/incubate/operators/softmax_mask_fuse.py
@@ -14,8 +14,7 @@
 
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.fluid.framework import _non_static_mode
-from paddle.fluid import core
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 
 
 def softmax_mask_fuse(x, mask, name=None):
diff --git a/python/paddle/incubate/operators/softmax_mask_fuse_upper_triangle.py b/python/paddle/incubate/operators/softmax_mask_fuse_upper_triangle.py
index 520a6d27e671a9f5c6d725b8d6f241b1b097f117..d73b8ba6d652e172e988884544a3e50cbaeb294a 100644
--- a/python/paddle/incubate/operators/softmax_mask_fuse_upper_triangle.py
+++ b/python/paddle/incubate/operators/softmax_mask_fuse_upper_triangle.py
@@ -14,8 +14,7 @@
 
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.fluid.framework import _non_static_mode
-from paddle.fluid import core
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 
 
 def softmax_mask_fuse_upper_triangle(x):
diff --git a/python/paddle/incubate/optimizer/distributed_fused_lamb.py b/python/paddle/incubate/optimizer/distributed_fused_lamb.py
index 3f3df92be5ebeb686990c7279487d02871de148a..56a9a99134775375439a129d71e046446302a14d 100644
--- a/python/paddle/incubate/optimizer/distributed_fused_lamb.py
+++ b/python/paddle/incubate/optimizer/distributed_fused_lamb.py
@@ -17,14 +17,11 @@ import paddle
 from paddle.fluid import framework, core, layers, unique_name
 from paddle.fluid.framework import Variable
 from paddle.fluid.clip import ClipGradByGlobalNorm
-from paddle.fluid.initializer import Constant
 from paddle.fluid.layer_helper import LayerHelper
 from paddle.fluid.optimizer import Optimizer
-from paddle.distributed.collective import new_group
 from paddle.fluid.executor import global_scope
 from paddle.fluid.framework import name_scope
 from paddle.fluid import core, unique_name
-import numpy as np
 
 
 def init_communicator(block, rank, ranks, ring_id):
diff --git a/python/paddle/incubate/optimizer/functional/utils.py b/python/paddle/incubate/optimizer/functional/utils.py
index 7a427c4489d3cb45333a87ffd8bde8defea916c3..e6612878e710c92ecaf4220f613688b3d3522a65 100644
--- a/python/paddle/incubate/optimizer/functional/utils.py
+++ b/python/paddle/incubate/optimizer/functional/utils.py
@@ -14,7 +14,7 @@
 
 import paddle
 from paddle.fluid.framework import Variable
-from paddle.fluid.data_feeder import check_type, check_dtype
+from paddle.fluid.data_feeder import check_type
 
 
 def check_input_type(input, name, op_name):
diff --git a/python/paddle/incubate/optimizer/lookahead.py b/python/paddle/incubate/optimizer/lookahead.py
index 31ebf9afcc70e50dd9cc6aa5d85757686e6cb85f..dcf50cb5224eded23b21e5fc516793c30fdc108d 100644
--- a/python/paddle/incubate/optimizer/lookahead.py
+++ b/python/paddle/incubate/optimizer/lookahead.py
@@ -13,11 +13,10 @@
 # limitations under the License.
 
 from paddle.optimizer import Optimizer
-from paddle.fluid import core, framework, layers, unique_name
-from paddle.fluid.framework import Program, Variable, name_scope, default_main_program, default_startup_program, device_guard
+from paddle.fluid import framework, layers, unique_name
+from paddle.fluid.framework import Variable
 from paddle.fluid.layer_helper import LayerHelper
 import paddle
-import numpy as np
 from paddle.fluid.dygraph import base as imperative_base
 
 __all__ = []
diff --git a/python/paddle/incubate/optimizer/modelaverage.py b/python/paddle/incubate/optimizer/modelaverage.py
index ebbe9cd78f4f08dce97da9f54ad66e40ae88f6fd..5fa9dfb67bcb43e517ebbe0f4e5a34b8cc763f83 100644
--- a/python/paddle/incubate/optimizer/modelaverage.py
+++ b/python/paddle/incubate/optimizer/modelaverage.py
@@ -13,11 +13,10 @@
 # limitations under the License.
 
 from paddle.optimizer import Optimizer
-from paddle.fluid import core, framework, layers
-from paddle.fluid.framework import Program, Variable
+from paddle.fluid import framework, layers
+from paddle.fluid.framework import Program
 from paddle.fluid.layer_helper import LayerHelper
 import paddle
-import numpy as np
 from paddle.fluid.dygraph import base as imperative_base
 from paddle.fluid.wrapped_decorator import signature_safe_contextmanager
 from paddle import _C_ops, _legacy_C_ops
diff --git a/python/paddle/incubate/passes/fuse_resnet_unit_pass.py b/python/paddle/incubate/passes/fuse_resnet_unit_pass.py
index 451ea1908f910d02c1eded6565495f1930eed246..fce745ffaf8c247c87b4c8b217444b224d7874bf 100644
--- a/python/paddle/incubate/passes/fuse_resnet_unit_pass.py
+++ b/python/paddle/incubate/passes/fuse_resnet_unit_pass.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import paddle
 import paddle.fluid.ir as ir
 
 
diff --git a/python/paddle/incubate/sparse/binary.py b/python/paddle/incubate/sparse/binary.py
index a39a0a756d78f331dde75514002807d79f2a73e5..c2592e0beb15619fafb5218187ec5e90c9fc22b5 100644
--- a/python/paddle/incubate/sparse/binary.py
+++ b/python/paddle/incubate/sparse/binary.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 from paddle.fluid.framework import dygraph_only, core
 from paddle import in_dynamic_mode
 from paddle.fluid.layer_helper import LayerHelper
diff --git a/python/paddle/incubate/sparse/creation.py b/python/paddle/incubate/sparse/creation.py
index 72f4b3fba610e3ec60cbc0f81254a242f926cc85..fe35b9cbd62cd3663b0e1cc7543b4e71c4408dca 100644
--- a/python/paddle/incubate/sparse/creation.py
+++ b/python/paddle/incubate/sparse/creation.py
@@ -13,11 +13,11 @@
 # limitations under the License.
 
 import paddle
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 from paddle.fluid.framework import core, dygraph_only
 from paddle.fluid.framework import _current_expected_place, _get_paddle_place
 from paddle.tensor import to_tensor, max
-from paddle.fluid.data_feeder import check_variable_and_dtype, check_type, check_dtype, convert_dtype
+from paddle.fluid.data_feeder import convert_dtype
 from paddle import in_dynamic_mode
 from paddle.fluid.layer_helper import LayerHelper
 
diff --git a/python/paddle/incubate/sparse/multiary.py b/python/paddle/incubate/sparse/multiary.py
index 5389ddc9fae5eb0022cefa5e7e3aa3a10cbcd65a..5a013930776326b65c44ef15ff3a846a62fc9705 100644
--- a/python/paddle/incubate/sparse/multiary.py
+++ b/python/paddle/incubate/sparse/multiary.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 from paddle.fluid.framework import dygraph_only
 
 __all__ = []
diff --git a/python/paddle/incubate/sparse/nn/functional/activation.py b/python/paddle/incubate/sparse/nn/functional/activation.py
index 7cc6920b3904f33d4e5dec44167bbd25f0e41303..0e83abd2390e8b7f1f757e3136a6e3c440e90c97 100644
--- a/python/paddle/incubate/sparse/nn/functional/activation.py
+++ b/python/paddle/incubate/sparse/nn/functional/activation.py
@@ -14,7 +14,7 @@
 
 __all__ = []
 
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 from paddle.fluid.framework import dygraph_only
 from paddle import in_dynamic_mode
 from paddle.fluid.layer_helper import LayerHelper
diff --git a/python/paddle/incubate/sparse/nn/functional/conv.py b/python/paddle/incubate/sparse/nn/functional/conv.py
index d8cece7cdef38d63cff9e94e33d075dce4eebe57..233af394ec535e17856e284ea6a6c63d39d8a8eb 100644
--- a/python/paddle/incubate/sparse/nn/functional/conv.py
+++ b/python/paddle/incubate/sparse/nn/functional/conv.py
@@ -14,10 +14,8 @@
 
 __all__ = []
 
-from paddle import _C_ops, _legacy_C_ops, in_dynamic_mode
+from paddle import _C_ops, in_dynamic_mode
 from paddle.fluid.layers.utils import convert_to_list
-from paddle.fluid.layers.nn import elementwise_add
-from ...creation import sparse_coo_tensor
 from ...binary import add
 from paddle.nn.functional.conv import _update_padding_nd
 from paddle.fluid.layer_helper import LayerHelper
diff --git a/python/paddle/incubate/sparse/nn/functional/pooling.py b/python/paddle/incubate/sparse/nn/functional/pooling.py
index 6acd303d0f20a7e4f8eb210c7602f89567478193..aedadc8e56ae29c816aceddc935ada8b8f90b713 100644
--- a/python/paddle/incubate/sparse/nn/functional/pooling.py
+++ b/python/paddle/incubate/sparse/nn/functional/pooling.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 from paddle.fluid.layers import utils
-from paddle import _C_ops, _legacy_C_ops, in_dynamic_mode
+from paddle import _C_ops, in_dynamic_mode
 from paddle.nn.functional.pooling import _update_padding_nd
 
 __all__ = []
diff --git a/python/paddle/incubate/sparse/nn/functional/transformer.py b/python/paddle/incubate/sparse/nn/functional/transformer.py
index 0ed230aa23cff48eae8c24a792e3b40cb8fe619a..26164720cd791b795f0d5bcc8d87b69681191019 100644
--- a/python/paddle/incubate/sparse/nn/functional/transformer.py
+++ b/python/paddle/incubate/sparse/nn/functional/transformer.py
@@ -14,7 +14,7 @@
 
 __all__ = []
 
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 from paddle.fluid.framework import dygraph_only
 
 
diff --git a/python/paddle/incubate/sparse/unary.py b/python/paddle/incubate/sparse/unary.py
index 7090ef44c75d987b3ac1c63fb36e2d7284859c3d..319f64118bc13c284fb6655620e93ee49ac2ce4a 100644
--- a/python/paddle/incubate/sparse/unary.py
+++ b/python/paddle/incubate/sparse/unary.py
@@ -14,7 +14,7 @@
 
 import numpy as np
 
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _C_ops
 from paddle.fluid.framework import dygraph_only, core, convert_np_dtype_to_dtype_
 
 __all__ = []
diff --git a/python/paddle/incubate/xpu/resnet_block.py b/python/paddle/incubate/xpu/resnet_block.py
index c584766730e026fb44fb6b6ea6a40101ea487666..1eb3637fa585197f5a839c5ebc1b70228848455c 100644
--- a/python/paddle/incubate/xpu/resnet_block.py
+++ b/python/paddle/incubate/xpu/resnet_block.py
@@ -12,26 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import copy
-import collections
-import itertools
-import six
-import math
-import sys
-import warnings
-from functools import partial, reduce
-
 import numpy as np
-import paddle
 import paddle.fluid as fluid
-from paddle import framework
 from paddle.nn import initializer as I
-from paddle.nn import Layer, LayerList
+from paddle.nn import Layer
 from paddle.fluid.layers import utils
 from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid.data_feeder import convert_dtype
 from paddle.fluid.param_attr import ParamAttr
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 
 __all__ = ['resnet_basic_block', 'ResNetBasicBlock']
 
diff --git a/python/paddle/metric/metrics.py b/python/paddle/metric/metrics.py
index aeec4022e218424eb20183b6917aa2f39a17d588..a7d8da75fec5233cf15f8eb5aed99da10fed6a35 100644
--- a/python/paddle/metric/metrics.py
+++ b/python/paddle/metric/metrics.py
@@ -18,9 +18,9 @@ import numpy as np
 
 from ..fluid.data_feeder import check_variable_and_dtype
 from ..fluid.layer_helper import LayerHelper
-from ..fluid.framework import core, _varbase_creator, _non_static_mode, _in_legacy_dygraph
+from ..fluid.framework import _non_static_mode, _varbase_creator
 import paddle
-from paddle import _C_ops, _legacy_C_ops
+from paddle import _legacy_C_ops
 
 __all__ = []
 
diff --git a/python/paddle/profiler/profiler.py b/python/paddle/profiler/profiler.py
index dcfeebcdc32f9c6e1425645f59b814f2ee9a084f..e4c32db2e9f836bf3be214c1be34b8b4df66f183 100644
--- a/python/paddle/profiler/profiler.py
+++ b/python/paddle/profiler/profiler.py
@@ -22,8 +22,8 @@ import importlib
 import json
 
 import paddle
-from paddle.fluid.core import (_Profiler, _ProfilerResult, ProfilerOptions,
-                               TracerEventType, enable_memory_recorder,
+from paddle.fluid.core import (_Profiler, ProfilerOptions, TracerEventType,
+                               enable_memory_recorder,
                                enable_input_shape_recorder,
                                disable_memory_recorder,
                                disable_input_shape_recorder)
diff --git a/python/paddle/profiler/statistic_helper.py b/python/paddle/profiler/statistic_helper.py
index 358f2a09b926415a00a3bc38d168885fc03bc6be..b6925a2b774820d863456b316c6dfdf5c2f1cb73 100644
--- a/python/paddle/profiler/statistic_helper.py
+++ b/python/paddle/profiler/statistic_helper.py
@@ -11,7 +11,6 @@
 # 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.
-import collections
 
 
 def sum_ranges(ranges):
diff --git a/python/paddle/profiler/timer.py b/python/paddle/profiler/timer.py
index 5fcc251510d78b6a378391840c9e6bda1247efa1..1f0fb6acde63cb871e56aa614153379ef98e83e3 100644
--- a/python/paddle/profiler/timer.py
+++ b/python/paddle/profiler/timer.py
@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import timeit
-import logging
 from collections import OrderedDict
 
 
diff --git a/python/paddle/text/datasets/conll05.py b/python/paddle/text/datasets/conll05.py
index 36bb6e5357bc821af92c4c66e8b16597b3deffd0..3e8889a1269d7c63c840765f975cddee1eee0aba 100644
--- a/python/paddle/text/datasets/conll05.py
+++ b/python/paddle/text/datasets/conll05.py
@@ -15,8 +15,6 @@
 import gzip
 import tarfile
 import numpy as np
-import six
-from six.moves import cPickle as pickle
 
 from paddle.io import Dataset
 import paddle.compat as cpt
diff --git a/python/paddle/text/datasets/movielens.py b/python/paddle/text/datasets/movielens.py
index abf27db6b3904b8c1f021371e9cf540b9184ae2c..c3d1de135b3005de93bdadd3a29160c0b483922c 100644
--- a/python/paddle/text/datasets/movielens.py
+++ b/python/paddle/text/datasets/movielens.py
@@ -15,11 +15,7 @@
 import numpy as np
 import zipfile
 import re
-import random
-import functools
-import six
 
-import paddle
 from paddle.io import Dataset
 import paddle.compat as cpt
 from paddle.dataset.common import _check_exists_and_download
diff --git a/python/paddle/text/datasets/wmt14.py b/python/paddle/text/datasets/wmt14.py
index 3266a68c0c30e84b8cb8201648e51ccbd679c36a..bfb665570ca2966a81a1ce94f430113c70c55b72 100644
--- a/python/paddle/text/datasets/wmt14.py
+++ b/python/paddle/text/datasets/wmt14.py
@@ -14,7 +14,6 @@
 
 import tarfile
 import numpy as np
-import gzip
 import six
 
 from paddle.io import Dataset
diff --git a/python/paddle/text/viterbi_decode.py b/python/paddle/text/viterbi_decode.py
index aa289a270c2e5a1a48de1c0dc028a68dce3dee2c..a2a92da947288ecf8aef8c9fd24cfb2242a93ebc 100644
--- a/python/paddle/text/viterbi_decode.py
+++ b/python/paddle/text/viterbi_decode.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 from ..nn import Layer
-from ..fluid.framework import core, _non_static_mode, in_dygraph_mode
+from ..fluid.framework import _non_static_mode, in_dygraph_mode
 from ..fluid.layer_helper import LayerHelper
 from ..fluid.data_feeder import check_variable_and_dtype, check_type
 from paddle import _C_ops, _legacy_C_ops