diff --git a/python/paddle/fluid/dygraph/dygraph_to_static/basic_api_transformer.py b/python/paddle/fluid/dygraph/dygraph_to_static/basic_api_transformer.py
index cf5723a7463b76335ec80e41146f3a7f52642116..198c2920eec7fdc81c6a06b27c9ed64f9754ec75 100644
--- a/python/paddle/fluid/dygraph/dygraph_to_static/basic_api_transformer.py
+++ b/python/paddle/fluid/dygraph/dygraph_to_static/basic_api_transformer.py
@@ -116,14 +116,14 @@ def is_to_variable(node):
 
 
 def to_assign_node(node):
-    # Transform dygraph api `fluid.dygraph.to_variable` alias `paddle.to_tensor` to static api `paddle.nn.functional.assign`.
+    # Transform dygraph api `fluid.dygraph.to_variable` alias `paddle.to_tensor` to static api `paddle.assign`.
     # NOTE:
     #   1. Api `to_variable` supports data type {float16, float32, float64, int16, int32, int64, uint8, uint16},
     #   but api `assign` only supports {float32, float64, int32, int64, bool};
     #   2. If the input of api `assign` is numpy.ndarray, its size cannot be greater than 1024 * 1024.
 
     assert isinstance(node, gast.Call)
-    assign_api = gast.parse('paddle.nn.functional.assign').body[0].value
+    assign_api = gast.parse('paddle.assign').body[0].value
     node.func = assign_api
 
     if node.args:
@@ -132,7 +132,7 @@ def to_assign_node(node):
     else:
         for idx, kw in enumerate(node.keywords):
             if kw.arg == 'value' or kw.arg == 'data':
-                node.keywords[idx].arg = 'input'
+                node.keywords[idx].arg = 'x'
                 node.keywords = [node.keywords[idx]]
                 node.args = []
                 break
diff --git a/python/paddle/fluid/layers/tensor.py b/python/paddle/fluid/layers/tensor.py
index 563933f8cd2e800feb9b6753d960ae3bf012eebf..51eb124c4796219c196135519ca08d750b8e5382 100644
--- a/python/paddle/fluid/layers/tensor.py
+++ b/python/paddle/fluid/layers/tensor.py
@@ -563,9 +563,9 @@ def assign(input, output=None):
                             [3, 4],
                             [1, 3]]).astype(np.int64)
           result1 = paddle.zeros(shape=[3, 3], dtype='float32')
-          paddle.nn.functional.assign(array, result1) # result1 = [[1, 1], [3 4], [1, 3]]
-          result2 = paddle.nn.functional.assign(data)  # result2 = [[2.5, 2.5], [2.5, 2.5], [2.5, 2.5]]
-          result3 = paddle.nn.functional.assign(np.array([[2.5, 2.5], [2.5, 2.5], [2.5, 2.5]], dtype='float32')) # result3 = [[2.5, 2.5], [2.5, 2.5], [2.5, 2.5]]
+          paddle.assign(array, result1) # result1 = [[1, 1], [3 4], [1, 3]]
+          result2 = paddle.assign(data)  # result2 = [[2.5, 2.5], [2.5, 2.5], [2.5, 2.5]]
+          result3 = paddle.assign(np.array([[2.5, 2.5], [2.5, 2.5], [2.5, 2.5]], dtype='float32')) # result3 = [[2.5, 2.5], [2.5, 2.5], [2.5, 2.5]]
     """
     helper = LayerHelper('assign', **locals())
     check_type(input, 'input', (Variable, numpy.ndarray), 'assign')
diff --git a/python/paddle/fluid/tests/unittests/test_inplace.py b/python/paddle/fluid/tests/unittests/test_inplace.py
index 45c208293e1b84dcc5263c42532869a3e6f9f806..08a7fe80ea1b181ef8364cd6b574ea73223a3b80 100644
--- a/python/paddle/fluid/tests/unittests/test_inplace.py
+++ b/python/paddle/fluid/tests/unittests/test_inplace.py
@@ -30,7 +30,7 @@ class TestInplace(unittest.TestCase):
             var[0] = 1.1
             self.assertEqual(var.inplace_version, 1)
 
-            paddle.nn.functional.assign(paddle.ones(shape=[3]), var)
+            paddle.assign(paddle.ones(shape=[3]), var)
 
             # NOTE(liym27): assign(input, output) is an inplace operation for output.
             # There is inplace-related processing for api assign, var.inplace_version should be 2 not 1.
diff --git a/python/paddle/nn/functional/__init__.py b/python/paddle/nn/functional/__init__.py
index abe34d2b3d74e76a924bcca5afc1908bcc5dd16a..501d9fcfd409db6076c36057df9fc8b9ea6c0f74 100644
--- a/python/paddle/nn/functional/__init__.py
+++ b/python/paddle/nn/functional/__init__.py
@@ -68,7 +68,6 @@ from .common import pad  #DEFINE_ALIAS
 from .common import cosine_similarity  #DEFINE_ALIAS
 from .common import unfold  #DEFINE_ALIAS
 # from .common import bilinear_tensor_product        #DEFINE_ALIAS
-from .common import assign  #DEFINE_ALIAS
 from .common import interpolate  #DEFINE_ALIAS
 from .common import upsample  #DEFINE_ALIAS
 from .common import bilinear  #DEFINE_ALIAS
diff --git a/python/paddle/nn/functional/common.py b/python/paddle/nn/functional/common.py
index fac5ca2f7936ee1e4f704bad03cbca4a938d1494..0859d05af1cf90404024e5dcfe2a2b9e49ea54b1 100644
--- a/python/paddle/nn/functional/common.py
+++ b/python/paddle/nn/functional/common.py
@@ -23,7 +23,6 @@ from ...fluid import dygraph_utils
 # from ...fluid import one_hot  #DEFINE_ALIAS
 # from ...fluid.layers import pad2d  #DEFINE_ALIAS
 from ...fluid.layers import unfold  #DEFINE_ALIAS
-from ...fluid.layers import assign  #DEFINE_ALIAS
 from ...fluid.layers import squeeze  #DEFINE_ALIAS
 from ...fluid.layers import unsqueeze  #DEFINE_ALIAS
 from ...tensor import clip
@@ -53,7 +52,6 @@ __all__ = [
     'pad',
     'unfold',
     #       'bilinear_tensor_product',
-    'assign',
     'interpolate',
     'upsample',
     'bilinear',