diff --git a/python/paddle/amp/auto_cast.py b/python/paddle/amp/auto_cast.py
index 6d0bc89296a28c8776764aa375c00d9144b7dc17..b01522b3ef8e069e1ba17b015402b48b1abdee5c 100644
--- a/python/paddle/amp/auto_cast.py
+++ b/python/paddle/amp/auto_cast.py
@@ -700,7 +700,7 @@ def auto_cast(
 
         with paddle.amp.auto_cast():
             conv = conv2d(data)
-            print(conv.dtype) # paddle.float32
+            print(conv.dtype) # paddle.float16
 
         with paddle.amp.auto_cast(enable=False):
             conv = conv2d(data)
@@ -714,11 +714,11 @@ def auto_cast(
         b = paddle.rand([2,3])
         with paddle.amp.auto_cast(custom_white_list={'elementwise_add'}):
             c = a + b
-            print(c.dtype) # paddle.float32
+            print(c.dtype) # paddle.float16
 
         with paddle.amp.auto_cast(custom_white_list={'elementwise_add'}, level='O2'):
             d = a + b
-            print(d.dtype) # paddle.float32
+            print(d.dtype) # paddle.float16
 
     """
     return amp_guard(enable, custom_white_list, custom_black_list, level, dtype)