diff --git a/documentation20/cn/12.taos-sql/docs.md b/documentation20/cn/12.taos-sql/docs.md
index b6bf522a9b872a04f463fad3a4885c89e8c453a3..e668cf02bd7ef65fcb6bd963860d97fe4a8eaa66 100755
--- a/documentation20/cn/12.taos-sql/docs.md
+++ b/documentation20/cn/12.taos-sql/docs.md
@@ -1801,9 +1801,9 @@ TDengine 中的表（列）名命名规则如下：
   1. 在where条件中时，支持函数match/nmatch/between and/like/and/or/is null/is no null，不支持in
 
      ```mysql 
-     select * from s1 where info→'k1' match 'v*'; 
+     select * from s1 where info->'k1' match 'v*'; 
 
-     select * from s1 where info→'k1' like 'v%' and info contains 'k2';
+     select * from s1 where info->'k1' like 'v%' and info contains 'k2';
 
      select * from s1 where info is null; 
   
@@ -1815,7 +1815,7 @@ TDengine 中的表（列）名命名规则如下：
   3. 支持distinct操作.
 
      ```mysql 
-     select distinct info→'k1' from s1
+     select distinct info->'k1' from s1
      ```
   
   5. 标签操作
@@ -1846,7 +1846,7 @@ TDengine 中的表（列）名命名规则如下：
   
      比如暂不支持 
      ```mysql 
-     select jtag→'key' from (select jtag from stable)
+     select jtag->'key' from (select jtag from stable)
      ```
   
      不支持