diff --git a/docs/cn/RocketMQ_Example.md b/docs/cn/RocketMQ_Example.md
index bd0fc80aec57f53f982d6e37df06b5747ff6f308..e26bcdf043d4b826181e276410bb42dde67353c7 100644
--- a/docs/cn/RocketMQ_Example.md
+++ b/docs/cn/RocketMQ_Example.md
@@ -572,7 +572,7 @@ public class ListSplitter implements Iterator<List<Message>> {
         return currIndex; 
     }
     private int calcMessageSize(Message message) {
-        int tmpSize = message.getTopic().length() + message.getBody().length(); 
+        int tmpSize = message.getTopic().length() + message.getBody().length; 
         Map<String, String> properties = message.getProperties();
         for (Map.Entry<String, String> entry : properties.entrySet()) {
             tmpSize += entry.getKey().length() + entry.getValue().length();