1、改表法 

mysql>use mysql; 

mysql>update user set host = '%' where user = 'root'; 

2、授权法 

例如，你想myuser使用mypassword从任何主机连接到mysql服务器的话。 

GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%'IDENTIFIED BY 'mypassword' WITH GRANT OPTION; 

如果你想允许用户myuser从ip为192.168.1.6的主机连接到mysql服务器，并使用mypassword作为密码 

GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'192.168.1.3'IDENTIFIED BY 'mypassword' WITH GRANT OPTION; 

刷新

FLUSH PRIVILEGES