diff --git a/content/zh/docs/Developerguide/ALTER-FUNCTION.md b/content/zh/docs/Developerguide/ALTER-FUNCTION.md
index 46deb1ee4a7d4f09e652a0c99bc09aecc203027f..ea41a2c6bc61a1d60d2f2eec763259938077443c 100644
--- a/content/zh/docs/Developerguide/ALTER-FUNCTION.md
+++ b/content/zh/docs/Developerguide/ALTER-FUNCTION.md
@@ -67,7 +67,7 @@
 
     标识该参数是输入、输出参数。
 
-    取值范围：IN/OUT/IN OUT
+    取值范围：IN/OUT/INOUT
 
 -   **argname**
 
diff --git a/content/zh/docs/Developerguide/CREATE-FUNCTION.md b/content/zh/docs/Developerguide/CREATE-FUNCTION.md
index 28fc1842cfce3e6ce7f578d45a55c4943a4c3b9e..993b2be0400a3f1b1be2e5b03f21a7dd465248c9 100644
--- a/content/zh/docs/Developerguide/CREATE-FUNCTION.md
+++ b/content/zh/docs/Developerguide/CREATE-FUNCTION.md
@@ -266,7 +266,7 @@ postgres=# CREATE FUNCTION func_dup_sql(in int, out f1 int, out f2 text)
 
 postgres=# SELECT * FROM func_dup_sql(42);
 
---计算两个整数的和，并返回结果。若果输入为null，则返回null。
+--计算两个整数的和，并返回结果。如果输入为null，则返回null。
 postgres=# CREATE FUNCTION func_add_sql2(num1 integer, num2 integer) RETURN integer
 AS
 BEGIN 
diff --git "a/content/zh/docs/Developerguide/\347\252\227\345\217\243\345\207\275\346\225\260.md" "b/content/zh/docs/Developerguide/\347\252\227\345\217\243\345\207\275\346\225\260.md"
index a3df5afe47fa7e9a5bc08d7faed44ed616222a72..b6abd6d5b651072e26670209d6dff64b47920acf 100644
--- "a/content/zh/docs/Developerguide/\347\252\227\345\217\243\345\207\275\346\225\260.md"
+++ "b/content/zh/docs/Developerguide/\347\252\227\345\217\243\345\207\275\346\225\260.md"
@@ -408,61 +408,62 @@
     (42 rows)
     ```
 
--   LEAD\(value any \[, offset integer \[, default any \]\]\)
-
-    描述：LEAD函数为各组内对应值生成提前值。即当前值对应的行数向后偏移offset位后所得行的value值作为序号。若经过向后偏移后行数超过当前组内的总行数，则对应结果取为default值。若无指定，在默认情况下，offset取为1，default值取为NULL。
-
-    返回值类型：与参数数据类型相同。
-
-    示例：
-
-    ```
-    postgres=# SELECT d_moy, d_fy_week_seq, lead(d_fy_week_seq,2) OVER(PARTITION BY d_moy ORDER BY d_fy_week_seq) FROM  tpcds.date_dim WHERE d_moy < 4 AND d_fy_week_seq < 7 ORDER BY 1,2;                 d_moy | d_fy_week_seq | lead 
-    -------+---------------+------
-         1 |             1 |    1
-         1 |             1 |    1
-         1 |             1 |    1
-         1 |             1 |    1
-         1 |             1 |    1
-         1 |             1 |    2
-         1 |             1 |    2
-         1 |             2 |    2
-         1 |             2 |    2
-         1 |             2 |    2
-         1 |             2 |    2
-         1 |             2 |    2
-         1 |             2 |    3
-         1 |             2 |    3
-         1 |             3 |    3
-         1 |             3 |    3
-         1 |             3 |    3
-         1 |             3 |    3
-         1 |             3 |    3
-         1 |             3 |    4
-         1 |             3 |    4
-         1 |             4 |    4
-         1 |             4 |    4
-         1 |             4 |    4
-         1 |             4 |    4
-         1 |             4 |    4
-         1 |             4 |    5
-         1 |             4 |    5
-         1 |             5 |     
-         1 |             5 |     
-         2 |             5 |    5
-         2 |             5 |    5
-         2 |             5 |    5
-         2 |             5 |    6
-         2 |             5 |    6
-         2 |             6 |    6
-         2 |             6 |    6
-         2 |             6 |    6
-         2 |             6 |    6
-         2 |             6 |    6
-         2 |             6 |     
-         2 |             6 |     
-    (42 rows)
-    ```
+- LEAD\(value any \[, offset integer \[, default any \]\]\)
+
+  描述：LEAD函数为各组内对应值生成提前值。即当前值对应的行数向后偏移offset位后所得行的value值作为序号。若经过向后偏移后行数超过当前组内的总行数，则对应结果取为default值。若无指定，在默认情况下，offset取为1，default值取为NULL。
+
+  返回值类型：与参数数据类型相同。
+
+  示例：
+
+  ```
+  postgres=# SELECT d_moy, d_fy_week_seq, lead(d_fy_week_seq,2) OVER(PARTITION BY d_moy ORDER BY d_fy_week_seq) FROM  tpcds.date_dim WHERE d_moy < 4 AND d_fy_week_seq < 7 ORDER BY 1,2;                
+  d_moy | d_fy_week_seq | lead 
+  -------+---------------+------
+       1 |             1 |    1
+       1 |             1 |    1
+       1 |             1 |    1
+       1 |             1 |    1
+       1 |             1 |    1
+       1 |             1 |    2
+       1 |             1 |    2
+       1 |             2 |    2
+       1 |             2 |    2
+       1 |             2 |    2
+       1 |             2 |    2
+       1 |             2 |    2
+       1 |             2 |    3
+       1 |             2 |    3
+       1 |             3 |    3
+       1 |             3 |    3
+       1 |             3 |    3
+       1 |             3 |    3
+       1 |             3 |    3
+       1 |             3 |    4
+       1 |             3 |    4
+       1 |             4 |    4
+       1 |             4 |    4
+       1 |             4 |    4
+       1 |             4 |    4
+       1 |             4 |    4
+       1 |             4 |    5
+       1 |             4 |    5
+       1 |             5 |     
+       1 |             5 |     
+       2 |             5 |    5
+       2 |             5 |    5
+       2 |             5 |    5
+       2 |             5 |    6
+       2 |             5 |    6
+       2 |             6 |    6
+       2 |             6 |    6
+       2 |             6 |    6
+       2 |             6 |    6
+       2 |             6 |    6
+       2 |             6 |     
+       2 |             6 |     
+  (42 rows)
+  ```
 
 -   FIRST\_VALUE\(value any\)