diff --git a/python/paddle/fluid/layers/control_flow.py b/python/paddle/fluid/layers/control_flow.py
index 5221ddaa825fc2af66829f94b3931d72d039b7d0..dba0021ef00fdbbc1e3a20cba3c5fb436ffe6390 100755
--- a/python/paddle/fluid/layers/control_flow.py
+++ b/python/paddle/fluid/layers/control_flow.py
@@ -1408,8 +1408,9 @@ def less_than(x, y, force_cpu=None, cond=None):
         x(${x_type}): ${x_comment}.
         y(${y_type}): ${y_comment}.
         force_cpu(${force_cpu_type}): ${force_cpu_comment}.
-        cond(Variable|None): Optional output variable to store the result of *less_than*
-
+        cond(Variable, optional): Optional output which can be any created Variable
+            that meets the requirements to store the result of *less_than*.
+            if cond is None, a new Varibale will be created to store the result.
     Returns:
         ${out_comment}.
 
@@ -1471,12 +1472,11 @@ def less_equal(x, y, cond=None):
     Args:
         x(Variable): First input to compare which is N-D tensor. The input data type should be float32, float64, int32, int64. 
         y(Variable): Second input to compare which is N-D tensor. The input data type should be float32, float64, int32, int64.
-        cond(Variable, optional): If is :attr:`None`, the op will create a variable as output tensor, the input shape and data type of \
-            this tensor is the same as input :attr:`x`. If is not :attr:`None`, the op will set the variable as output tensor, the input shape \
-            and data type of this tensor should be the same as input :attr:`x`. Default value is :attr:`None`.
+        cond(Variable, optional): Optional output which can be any created Variable that meets the requirements to store the result of *less_equal*.
+            if cond is None, a new Varibale will be created to store the result.
 
     Returns:
-        Variable, the output data type is bool.: The tensor variable storing the output, the output shape is the same as input :attr:`x`.
+        Variable, the output data type is bool: The tensor variable storing the output, the output shape is same as input :attr:`x`.
 
     Examples:
         .. code-block:: python
@@ -1494,8 +1494,7 @@ def less_equal(x, y, cond=None):
     check_variable_and_dtype(y, "y", ["float32", "float64", "int32", "int64"],
                              "less_equal")
     if cond is not None:
-        check_variable_and_dtype(cond, "cond", [convert_dtype(x.dtype)],
-                                 "less_equal")
+        check_type(cond, "cond", Variable, "less_equal")
 
     helper = LayerHelper("less_equal", **locals())
     if cond is None:
@@ -1521,12 +1520,11 @@ def greater_than(x, y, cond=None):
     Args:
         x(Variable): First input to compare which is N-D tensor. The input data type should be float32, float64, int32, int64. 
         y(Variable): Second input to compare which is N-D tensor. The input data type should be float32, float64, int32, int64.
-        cond(Variable, optional): If is :attr:`None`, the op will create a variable as output tensor, the shape and data type of this \
-            tensor is the same as input :attr:`x` . If is not :attr:`None`, the op will set the variable as output tensor, the shape and data type \
-            of this tensor should be the same as input :attr:`x` . Default value is :attr:`None`.
+        cond(Variable, optional): Optional output which can be any created Variable that meets the requirements to store the result of *greater_than*.
+            if cond is None, a new Varibale will be created to store the result.
 
     Returns:
-        Variable, the output data type is bool.: The tensor variable storing the output, the output shape is the same as input :attr:`x` .
+        Variable, the output data type is bool: The tensor variable storing the output, the output shape is same as input :attr:`x` .
 
     Examples:
         .. code-block:: python
@@ -1543,8 +1541,7 @@ def greater_than(x, y, cond=None):
     check_variable_and_dtype(y, "y", ["float32", "float64", "int32", "int64"],
                              "greater_than")
     if cond is not None:
-        check_variable_and_dtype(cond, "cond", [convert_dtype(x.dtype)],
-                                 "greater_than")
+        check_type(cond, "cond", Variable, "greater_than")
 
     helper = LayerHelper("greater_than", **locals())
     if cond is None:
@@ -1570,12 +1567,11 @@ def greater_equal(x, y, cond=None):
     Args:
         x(Variable): First input to compare which is N-D tensor. The input data type should be float32, float64, int32, int64. 
         y(Variable): Second input to compare which is N-D tensor. The input data type should be float32, float64, int32, int64.
-        cond(Variable, optional): If is :attr:`None` , the op will create a variable as output tensor, the shape and data type of this \
-            tensor is the same as input :attr:`x`. If is not :attr:`None` , the op will set the variable as output tensor, the shape and data \
-            type of this tensor is the same as input :attr:`x`. Default value is :attr:`None`.
+        cond(Variable, optional): Optional output which can be any created Variable that meets the requirements to store the result of *greater_equal*.
+            if cond is None, a new Varibale will be created to store the result.
 
     Returns:
-        Variable, the output data type is bool.: The tensor variable storing the output, the output shape is the same as input :attr:`x`.
+        Variable, the output data type is bool: The tensor variable storing the output, the output shape is same as input :attr:`x`.
 
     Examples:
         .. code-block:: python
@@ -1594,8 +1590,7 @@ def greater_equal(x, y, cond=None):
     check_variable_and_dtype(y, "y", ["float32", "float64", "int32", "int64"],
                              "greater_equal")
     if cond is not None:
-        check_variable_and_dtype(cond, "cond", [convert_dtype(x.dtype)],
-                                 "greater_equal")
+        check_type(cond, "cond", Variable, "greater_equal")
 
     helper = LayerHelper("greater_equal", **locals())
     if cond is None:
@@ -1645,8 +1640,7 @@ def equal(x, y, cond=None):
     check_variable_and_dtype(y, "y", ["float32", "float64", "int32", "int64"],
                              "equal")
     if cond is not None:
-        check_variable_and_dtype(cond, "cond", [convert_dtype(x.dtype)],
-                                 "equal")
+        check_type(cond, "cond", Variable, "equal")
 
     helper = LayerHelper("equal", **locals())
     if cond is None:
@@ -1666,12 +1660,11 @@ def not_equal(x, y, cond=None):
     Args:
         x(Variable): First input to compare which is N-D tensor. The input data type should be float32, float64, int32, int64. 
         y(Variable): Second input to compare which is N-D tensor. The input data type should be float32, float64, int32, int64.
-        cond(Variable, optional): If is :attr:`None`, the op will create a variable as output tensor, the shape and data type of this \
-             tensor is the same as input :attr:`x`. If is not :attr:`None`, the op will set the variable as output tensor, the shape and data \
-             type of this tensor should be the same as input :attr:`x`. Default value is :attr:`None`.
+        cond(Variable, optional): Optional output which can be any created Variable that meets the requirements to store the result of *not_equal*.
+            if cond is None, a new Varibale will be created to store the result.
 
     Returns:
-        Variable, the output data type is bool.: The tensor variable storing the output, the output shape is the same as input :attr:`x`.
+        Variable, the output data type is bool: The tensor variable storing the output, the output shape is same as input :attr:`x`.
 
     Examples:
         .. code-block:: python
@@ -1687,8 +1680,7 @@ def not_equal(x, y, cond=None):
     check_variable_and_dtype(y, "y", ["float32", "float64", "int32", "int64"],
                              "not_equal")
     if cond is not None:
-        check_variable_and_dtype(cond, "cond", [convert_dtype(x.dtype)],
-                                 "not_equal")
+        check_type(cond, "cond", Variable, "not_equal")
 
     helper = LayerHelper("not_equal", **locals())
     if cond is None:
diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index f4b7ec90cd5db6bac63f53ef4d503bd9e7f5b98f..6f6166dbdfa1e5675ce645b101cb36ce18994d21 100644
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -11432,7 +11432,7 @@ def _logical_op(op_name, x, y, out=None, name=None, binary_op=True):
     if y is not None:
         check_variable_and_dtype(y, "y", ["bool"], op_name)
     if out is not None:
-        check_variable_and_dtype(out, "out", [convert_dtype(x.dtype)], op_name)
+        check_type(out, "out", Variable, op_name)
 
     helper = LayerHelper(op_name, **locals())
 
diff --git a/python/paddle/fluid/tests/unittests/test_compare_op.py b/python/paddle/fluid/tests/unittests/test_compare_op.py
index eed1aad405ac12222c0ce6d59530dc52ac31383c..9d4a9082b543c1bef67f2a203c27b63bf89c1ef5 100644
--- a/python/paddle/fluid/tests/unittests/test_compare_op.py
+++ b/python/paddle/fluid/tests/unittests/test_compare_op.py
@@ -41,7 +41,6 @@ def create_test_class(op_type, typename, callback):
                 x = fluid.layers.data(name='x', shape=[2], dtype='int32')
                 y = fluid.layers.data(name='y', shape=[2], dtype='int32')
                 a = fluid.layers.data(name='a', shape=[2], dtype='int16')
-                b = fluid.layers.data(name='b', shape=[2], dtype='int64')
                 if self.op_type == "less_than":
                     self.assertRaises(
                         TypeError,
@@ -51,8 +50,6 @@ def create_test_class(op_type, typename, callback):
                         force_cpu=1)
                 op = eval("fluid.layers.%s" % self.op_type)
                 self.assertRaises(TypeError, op, x=x, y=y, cond=1)
-                if self.op_type != "less_than":
-                    self.assertRaises(TypeError, op, x=x, y=y, cond=b)
                 self.assertRaises(TypeError, op, x=x, y=a)
                 self.assertRaises(TypeError, op, x=a, y=y)
 
diff --git a/python/paddle/fluid/tests/unittests/test_logical_op.py b/python/paddle/fluid/tests/unittests/test_logical_op.py
index 87156ca98c4b2d7ca9fe764cbcbf13a7595c600e..8f0049a8d30d0e1fed1d27cf6e13c036e33678d0 100644
--- a/python/paddle/fluid/tests/unittests/test_logical_op.py
+++ b/python/paddle/fluid/tests/unittests/test_logical_op.py
@@ -50,10 +50,8 @@ def create_test_class(op_type, callback, binary_op=True):
                     self.assertRaises(TypeError, op, x=x, y=y, out=1)
                     self.assertRaises(TypeError, op, x=x, y=a)
                     self.assertRaises(TypeError, op, x=a, y=y)
-                    self.assertRaises(TypeError, op, x=x, y=y, out=a)
                 else:
                     self.assertRaises(TypeError, op, x=x, out=1)
-                    self.assertRaises(TypeError, op, x=x, out=a)
                     self.assertRaises(TypeError, op, x=a)
 
     Cls.__name__ = op_type