diff --git a/python/paddle/fluid/backward.py b/python/paddle/fluid/backward.py
index 590d76ae1708f3dc17f048f3b1bf005f834d0bed..c40b8db6948cf3c07aa7c0b41eef0bfa576e8e6e 100644
--- a/python/paddle/fluid/backward.py
+++ b/python/paddle/fluid/backward.py
@@ -1345,7 +1345,7 @@ def append_backward(loss,
             x = paddle.static.data(name='x', shape=[None, 13], dtype='int64')
             y = paddle.static.data(name='y', shape=[None, 1], dtype='float32')
             x_emb = paddle.static.nn.embedding(x, size=[100, 256])
-            y_predict = paddle.static.nn.fc(input=x_emb, size=1, act=None, name='my_fc')
+            y_predict = paddle.static.nn.fc(x=x_emb, size=1, activation=None, name='my_fc')
             loss = F.square_error_cost(input=y_predict, label=y)
             avg_loss = paddle.mean(loss)
 
diff --git a/python/paddle/fluid/compiler.py b/python/paddle/fluid/compiler.py
index 31cacf075b7eff4b3330d064b2172c77ffb5b0b3..0b980c7ebab58210785db3f4f1fe5f746eb8435a 100644
--- a/python/paddle/fluid/compiler.py
+++ b/python/paddle/fluid/compiler.py
@@ -120,7 +120,7 @@ class CompiledProgram(object):
             exe = static.Executor(place)
 
             data = static.data(name='X', shape=[None, 1], dtype='float32')
-            hidden = static.nn.fc(input=data, size=10)
+            hidden = static.nn.fc(x=data, size=10)
             loss = paddle.mean(hidden)
             paddle.optimizer.SGD(learning_rate=0.01).minimize(loss)
 
@@ -243,7 +243,7 @@ class CompiledProgram(object):
                 exe = static.Executor(place)
 
                 data = static.data(name='X', shape=[None, 1], dtype='float32')
-                hidden = static.nn.fc(input=data, size=10)
+                hidden = static.nn.fc(x=data, size=10)
                 loss = paddle.mean(hidden)
 
                 test_program = static.default_main_program().clone(for_test=True)
diff --git a/python/paddle/fluid/framework.py b/python/paddle/fluid/framework.py
index 939665cb16ae1faa209d44c2639526081d6bf9c8..dbf70e286c24d98760fe9110bc8adcf90c49d1ae 100644
--- a/python/paddle/fluid/framework.py
+++ b/python/paddle/fluid/framework.py
@@ -3996,7 +3996,7 @@ class Program(object):
             with static.program_guard(main_program=main_program, startup_program=startup_program):
                 x = static.data(name="x", shape=[-1, 784], dtype='float32')
                 y = static.data(name="y", shape=[-1, 1], dtype='int32')
-                z = static.nn.fc(name="fc", input=x, size=10, act="relu")
+                z = static.nn.fc(name="fc", x=x, size=10, activation="relu")
 
             print("main program is: {}".format(main_program))
             print("start up program is: {}".format(startup_program))
@@ -4344,7 +4344,7 @@ class Program(object):
             paddle.enable_static()
 
             img = static.data(name='image', shape=[None, 784])
-            pred = static.nn.fc(input=img, size=10, act='relu')
+            pred = static.nn.fc(x=img, size=10, actvation='relu')
             loss = paddle.mean(pred)
             # Here we use clone before Momentum
             test_program = static.default_main_program().clone(for_test=True)
@@ -4415,10 +4415,10 @@ class Program(object):
                     with static.program_guard(train_program, startup_program):
                         with utils.unique_name.guard():
                             img = static.data(name='image', shape=[None, 784])
-                            hidden = static.nn.fc(input=img, size=200, act='relu')
+                            hidden = static.nn.fc(x=img, size=200, activation='relu')
                             hidden = F.dropout(hidden, p=0.5)
                             loss = F.cross_entropy(
-                                input=static.nn.fc(hidden, size=10, act='softmax'),
+                                input=static.nn.fc(x=hidden, size=10, activation='softmax'),
                                 label=static.data(name='label', shape=[1], dtype='int64'))
                             avg_loss = paddle.mean(loss)
                             test_program = train_program.clone(for_test=True)
@@ -4462,10 +4462,10 @@ class Program(object):
 
                     def network():
                         img = static.data(name='image', shape=[None, 784])
-                        hidden = static.nn.fc(input=img, size=200, act='relu')
+                        hidden = static.nn.fc(x=img, size=200, activation='relu')
                         hidden = F.dropout(hidden, p=0.5)
                         loss = F.cross_entropy(
-                            input=static.nn.fc(hidden, size=10, act='softmax'),
+                            input=static.nn.fc(x=hidden, size=10, activation='softmax'),
                             label=static.data(name='label', shape=[1], dtype='int64'))
                         avg_loss = paddle.mean(loss)
                         return avg_loss
@@ -5079,7 +5079,7 @@ class Program(object):
 
                 program = static.default_main_program()
                 data = static.data(name='x', shape=[None, 13], dtype='float32')
-                hidden = static.nn.fc(input=data, size=10)
+                hidden = static.nn.fc(x=data, size=10)
                 loss = paddle.mean(hidden)
                 paddle.optimizer.SGD(learning_rate=0.01).minimize(loss)
 
@@ -5347,7 +5347,7 @@ def default_startup_program():
             with paddle.static.program_guard(main_program=main_program, startup_program=startup_program):
                 x = paddle.data(name="x", shape=[-1, 784], dtype='float32')
                 y = paddle.data(name="y", shape=[-1, 1], dtype='int32')
-                z = paddle.static.nn.fc(name="fc", input=x, size=10, act="relu")
+                z = paddle.static.nn.fc(name="fc", x=x, size=10, activation="relu")
 
                 print("main program is: {}".format(paddle.static.default_main_program()))
                 print("start up program is: {}".format(paddle.static.default_startup_program()))
@@ -5389,8 +5389,8 @@ def default_main_program():
             bn2 = paddle.static.nn.batch_norm(conv2, act='relu')
             pool2 = paddle.nn.functional.pool2d(bn2, 2, 'max', 2)
             
-            fc1 = paddle.static.nn.fc(pool2, size=50, act='relu')
-            fc2 = paddle.static.nn.fc(fc1, size=102, act='softmax')
+            fc1 = paddle.static.nn.fc(x=pool2, size=50, activation='relu')
+            fc2 = paddle.static.nn.fc(x=fc1, size=102, activation='softmax')
             
             loss = paddle.nn.functional.loss.cross_entropy(input=fc2, label=label)
             loss = paddle.mean(loss)
@@ -5467,7 +5467,7 @@ def program_guard(main_program, startup_program=None):
           startup_program = paddle.static.Program()
           with paddle.static.program_guard(main_program, startup_program):
               data = paddle.static.data(name='image', shape=[None, 784, 784], dtype='float32')
-              hidden = paddle.static.nn.fc(input=data, size=10, act='relu')
+              hidden = paddle.static.nn.fc(x=data, size=10, activation='relu')
 
     Notes: The temporary :code:`Program` can be used if the user does not need
     to construct either of startup program or main program.
diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index dcfead697b94f2ae24ad70a76e763d30d01e7d09..83e282920d02a2e0d9f6f1e5b66a7e6d00b63a9c 100755
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -13598,7 +13598,7 @@ def py_func(func, x, out, backward_func=None, skip_vars_in_backward_input=None):
                     # User-defined debug functions that print out the input Tensor
                     paddle.static.nn.py_func(func=debug_func, x=hidden, out=None)
 
-                prediction = paddle.static.nn.fc(hidden, size=10, act='softmax')
+                prediction = paddle.static.nn.fc(hidden, size=10, activation='softmax')
                 loss = paddle.static.nn.cross_entropy(input=prediction, label=label)
                 return paddle.mean(loss)
 
diff --git a/python/paddle/fluid/param_attr.py b/python/paddle/fluid/param_attr.py
index bf042393706938a61dc74e8af243467cdb99f6dc..4105d5c1a4e49821e7da3423271e2b67b030936b 100644
--- a/python/paddle/fluid/param_attr.py
+++ b/python/paddle/fluid/param_attr.py
@@ -264,17 +264,17 @@ class WeightNormParamAttr(ParamAttr):
 
             data = paddle.static.data(name="data", shape=[3, 32, 32], dtype="float32")
 
-            fc = paddle.static.nn.fc(input=data,
+            fc = paddle.static.nn.fc(x=data,
                                      size=1000,
-                                     param_attr=paddle.static.WeightNormParamAttr(
-                                                dim=None,
-                                                name='weight_norm_param',
-                                                initializer=paddle.nn.initializer.Constant(1.0),
-                                                learning_rate=1.0,
-                                                regularizer=paddle.regularizer.L2Decay(0.1),
-                                                trainable=True,
-                                                do_model_average=False,
-                                                need_clip=True))
+                                     weight_attr=paddle.static.WeightNormParamAttr(
+                                         dim=None,
+                                         name='weight_norm_param',
+                                         initializer=paddle.nn.initializer.Constant(1.0),
+                                         learning_rate=1.0,
+                                         regularizer=paddle.regularizer.L2Decay(0.1),
+                                         trainable=True,
+                                         do_model_average=False,
+                                         need_clip=True))
 
     """
     # List to record the parameters reparameterized by weight normalization.