diff --git a/docs/en/12-taos-sql/19-limit.md b/docs/en/12-taos-sql/19-limit.md
index 22ad2055e4633fcf63baeb4470d0f2aafddac5b3..23bb8ce91705ddbb0a7e1d3580072d467efa95ad 100644
--- a/docs/en/12-taos-sql/19-limit.md
+++ b/docs/en/12-taos-sql/19-limit.md
@@ -36,7 +36,7 @@ The following characters cannot occur in a password: single quotation marks ('),
 - Maximum numbers of databases, STables, tables are dependent only on the system resources.
 - The number of replicas can only be 1 or 3.
 - The maximum length of a username is 23 bytes.
-- The maximum length of a password is 128 bytes.
+- The maximum length of a password is 31 bytes.
 - The maximum number of rows depends on system resources.
 - The maximum number of vnodes in a database is 1024.
 
diff --git a/docs/en/12-taos-sql/25-grant.md b/docs/en/12-taos-sql/25-grant.md
index 8e3e7c869e9db38e060f8ed2e942aaf123fb3415..c214e11876c77f4c617e1103b14ee46e6d211ca9 100644
--- a/docs/en/12-taos-sql/25-grant.md
+++ b/docs/en/12-taos-sql/25-grant.md
@@ -16,7 +16,7 @@ This statement creates a user account.
 
 The maximum length of user_name is 23 bytes.
 
-The maximum length of password is 32 bytes. The password can include leters, digits, and special characters excluding single quotation marks, double quotation marks, backticks, backslashes, and spaces. The password cannot be empty.
+The maximum length of password is 31 bytes. The password can include leters, digits, and special characters excluding single quotation marks, double quotation marks, backticks, backslashes, and spaces. The password cannot be empty.
 
 `SYSINFO` indicates whether the user is allowed to view system information. `1` means allowed, `0` means not allowed. System information includes server configuration, dnode, vnode, storage. The default value is `1`.
 
diff --git a/docs/zh/12-taos-sql/19-limit.md b/docs/zh/12-taos-sql/19-limit.md
index e5a492580ec8ee63d41ca0f09370b96356fd9489..6c815fc5f0fe8967fe3ae0bf350a16a2e86ded62 100644
--- a/docs/zh/12-taos-sql/19-limit.md
+++ b/docs/zh/12-taos-sql/19-limit.md
@@ -36,7 +36,7 @@ description: 合法字符集和命名中的限制规则
 - 库的数目，超级表的数目、表的数目，系统不做限制，仅受系统资源限制
 - 数据库的副本数只能设置为 1 或 3
 - 用户名的最大长度是 23 字节
-- 用户密码的最大长度是 128 字节
+- 用户密码的最大长度是 31 字节
 - 总数据行数取决于可用资源
 - 单个数据库的虚拟结点数上限为 1024
 
diff --git a/docs/zh/12-taos-sql/25-grant.md b/docs/zh/12-taos-sql/25-grant.md
index e4ba02cbb5768f85efc3f8b89ff82d77199e8bbb..a9c3910500d7ad3ba2435eb4bebb74085a10da78 100644
--- a/docs/zh/12-taos-sql/25-grant.md
+++ b/docs/zh/12-taos-sql/25-grant.md
@@ -16,7 +16,7 @@ CREATE USER use_name PASS 'password' [SYSINFO {1|0}];
 
 use_name 最长为 23 字节。
 
-password 最长为 32 字节，合法字符包括"a-zA-Z0-9!?$%^&*()_–+={[}]:;@~#|<,>.?/"，不可以出现单双引号、撇号、反斜杠和空格，且不可以为空。
+password 最长为 31 字节，合法字符包括"a-zA-Z0-9!?$%^&*()_–+={[}]:;@~#|<,>.?/"，不可以出现单双引号、撇号、反斜杠和空格，且不可以为空。
 
 SYSINFO 表示用户是否可以查看系统信息。1 表示可以查看，0 表示不可以查看。系统信息包括服务端配置信息、服务端各种节点信息（如 DNODE、QNODE等）、存储相关的信息等。默认为可以查看系统信息。