怎么修改mysql密码

1.用root 进入mysql后
mysql>set password =password('你的密码');
mysql>flush privileges;

2.使用GRANT语句 
mysql>grant all on *.* to 'root'@'localhost' IDENTIFIED BY '你的密码'with grant option ;
mysql>flush privileges;

3.进入mysql库修改user表
mysql>use mysql;
mysql>update user set password=password('你的密码') where user='root'; 
mysql>flush privileges;