diff --git a/x2paddle/op_mapper/paddle2onnx/opset9/opset.py b/x2paddle/op_mapper/paddle2onnx/opset9/opset.py
index 5973fa4b6ff05008d2a60605e9028a4afc66ef56..14cba9a4f422cd042cb06e33a4f678291d74a564 100644
--- a/x2paddle/op_mapper/paddle2onnx/opset9/opset.py
+++ b/x2paddle/op_mapper/paddle2onnx/opset9/opset.py
@@ -400,7 +400,7 @@ class OpSet9(object):
 
     def sum(self, op, block):
         node = helper.make_node(
-            'Sum', inputs=op.input('X'), outputs=op.output('Y'))
+            'Sum', inputs=op.input('X'), outputs=op.output('Out'))
         return node
 
     def depthwise_conv2d(self, op, block):