方法1： 用SET PASSWORD命令

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mysql -u root
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');

方法2：用mysqladmin

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mysqladmin -u root password "newpass"
#如果root已经设置过密码，采用如下方法
mysqladmin -u root password oldpass "newpass"

方法3： 用UPDATE直接编辑user表

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mysql -u root
mysql> use mysql;
mysql> UPDATE user SET Password = PASSWORD('newpass') WHERE user = 'root';
mysql> FLUSH PRIVILEGES;

在丢失root密码的时候，可以这样

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mysqld_safe --skip-grant-tables&
mysql -u root mysql
mysql> UPDATE user SET password=PASSWORD("new password") WHERE user='root';
mysql> FLUSH PRIVILEGES;

The End

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• 转载自百度经验：MySQL修改root密码的多种方法