diff --git a/python/paddle/fluid/dygraph/varbase_patch_methods.py b/python/paddle/fluid/dygraph/varbase_patch_methods.py
index 39c6740d832aa503c7959685ba6c16f429228001..0f65bdd6f210090fdc883bed31c62fc52c741343 100644
--- a/python/paddle/fluid/dygraph/varbase_patch_methods.py
+++ b/python/paddle/fluid/dygraph/varbase_patch_methods.py
@@ -162,8 +162,8 @@ def monkey_patch_varbase():
                     # there is no one need gradient on it.
                     tmp.stop_gradient=False
                     inputs.append(tmp)
-                ret = paddle.sums(inputs)
-                loss = paddle.fluid.layers.reduce_sum(ret)
+                ret = paddle.add_n(inputs)
+                loss = paddle.sum(ret)
                 loss.backward()
 
         """
diff --git a/python/paddle/fluid/framework.py b/python/paddle/fluid/framework.py
index a4cb92f72975fa67224d0d1f40f415869274b7ea..d31b434103205a920ef8a83bf87f912b93d292ed 100644
--- a/python/paddle/fluid/framework.py
+++ b/python/paddle/fluid/framework.py
@@ -1192,8 +1192,8 @@ class Variable(object):
                     # there is no one need gradient on it.
                     tmp.stop_gradient=False
                     inputs.append(tmp)
-                ret = paddle.sums(inputs)
-                loss = paddle.fluid.layers.reduce_sum(ret)
+                ret = paddle.add_n(inputs)
+                loss = paddle.sum(ret)
                 loss.backward()
 
         """