1.net stop mysql

2.my.ini中[mysqld]plugin_dir的下面增加skip-grant-tables

3.net start mysql

4.在Navicat中打开mysql数据库执行：UPDATE `user` SET Password = password ('new-password') WHERE User= 'root';

5.在my.ini中[mysqld]plugin_dir的下面去掉skip-grant-tables

6.关闭mysql服务，重新启动mysql服务