diff --git a/SQL_Parser_Demo_visitor.md b/SQL_Parser_Demo_visitor.md
index 72e6ed6..5f76fb8 100644
--- a/SQL_Parser_Demo_visitor.md
+++ b/SQL_Parser_Demo_visitor.md
@@ -1,5 +1,5 @@
-# 实现自己的Visitor
-## Oracle版本
+# 1. 实现自己的Visitor
+## 1.1 Oracle版本
 ```java
 public static class ExportTableAliasVisitor extends OracleASTVisitorAdapter {
     private Map<String, SQLTableSource> aliasMap = new HashMap<String, SQLTableSource>();
@@ -15,7 +15,7 @@ public static class ExportTableAliasVisitor extends OracleASTVisitorAdapter {
 }
 ```
 
-## MySql版本
+## 1.2 MySql版本
 ```java
 public static class ExportTableAliasVisitor extends MySqlASTVisitorAdapter {
     private Map<String, SQLTableSource> aliasMap = new HashMap<String, SQLTableSource>();
@@ -32,7 +32,7 @@ public static class ExportTableAliasVisitor extends MySqlASTVisitorAdapter {
 ```
 
 
-## POSTGRESQL版本
+## 1.3 POSTGRESQL版本
 ```java
 public static class ExportTableAliasVisitor extends PGASTVisitorAdapter {
     private Map<String, SQLTableSource> aliasMap = new HashMap<String, SQLTableSource>();
@@ -48,9 +48,9 @@ public static class ExportTableAliasVisitor extends PGASTVisitorAdapter {
 }
 ```
 
-# 使用Visitor
+# 2. 使用Visitor
 ```java
-finnal String dbType = JdbcConstants.ORACLE; // MYSQL或者POSTGRESQL
+finnal String dbType = JdbcConstants.ORACLE; // JdbcConstants.MYSQL或者JdbcConstants.POSTGRESQL
 String sql = "select * from mytable a where a.id = 3";
 List<SQLStatement> stmtList = SQLUtils.parseStatements(sql, dbType);