diff --git a/documentation20/cn/12.taos-sql/docs.md b/documentation20/cn/12.taos-sql/docs.md
index 7ad3571932d11a4c2fcfada4b85e99b04ead97ef..1bd55bca1058ac21727e767ce29cfaed1beae035 100755
--- a/documentation20/cn/12.taos-sql/docs.md
+++ b/documentation20/cn/12.taos-sql/docs.md
@@ -1669,7 +1669,7 @@ SELECT COUNT(*), FIRST(ts), status FROM temp_tb_1 STATE_WINDOW(status)
 
 ```mysql
 
-SELECT COUNT(*), FIRST(ts) FROM temp_tb_1 SESSION_WINDOW(ts, tol_val)
+SELECT COUNT(*), FIRST(ts) FROM temp_tb_1 SESSION(ts, tol_val)
 ```
 
 这种类型的查询语法如下：