1、首先启动mysqld，无授权验证模式，为了安全，将监听地址bind在localhost

cmd>mysqld --skip-grant-tables --bind-address=localhost

2、运行mysql

cmd>mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.0.90-community-nt MySQL Community Edition (GPL)Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> use mysql;mysql> select host, user, password from user;+-----------+------+-------------------------------------------+| host      | user | password                                  |+-----------+------+-------------------------------------------+| localhost | root | *41DDB5DFD213B288EE050BD64DC6AA36815A3486 |+-----------+------+-------------------------------------------+1 row in set (0.00 sec)mysql> UPDATE user SET password=password('888') WHERE user='root';Query OK, 0 rows affected (0.00 sec)Rows matched: 1  Changed: 0  Warnings: 0mysql> flush privileges;Query OK, 0 rows affected (0.13 sec)mysql> quit;Byecmd>