diff --git a/python/paddle/base/dygraph/math_op_patch.py b/python/paddle/base/dygraph/math_op_patch.py
index 1a73e6b5e9ae0..80108f4ed65e9 100644
--- a/python/paddle/base/dygraph/math_op_patch.py
+++ b/python/paddle/base/dygraph/math_op_patch.py
@@ -85,14 +85,15 @@ def astype(self, dtype):
         Examples:
             .. code-block:: python
 
-                import paddle
-                import numpy as np
-
-                original_tensor = paddle.ones([2, 2])
-                print("original tensor's dtype is: {}".format(original_tensor.dtype))
-                new_tensor = original_tensor.astype('float32')
-                print("new tensor's dtype is: {}".format(new_tensor.dtype))
-
+                >>> import paddle
+                >>> import numpy as np
+
+                >>> original_tensor = paddle.ones([2, 2])
+                >>> print("original tensor's dtype is: {}".format(original_tensor.dtype))
+                original tensor's dtype is: paddle.float32
+                >>> new_tensor = original_tensor.astype('float32')
+                >>> print("new tensor's dtype is: {}".format(new_tensor.dtype))
+                new tensor's dtype is: paddle.float32
         """
         if not isinstance(dtype, core.VarDesc.VarType):
             dtype = convert_np_dtype_to_dtype_(dtype)