(1) 查找已有的用户及对应的ip SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user; (2) 检查对应用户在ip上的授权 show grants for 'name'@'ip'; (3)收回所有权限 revoke all privileges on . from 'name'@'ip'; (4)删除某个ip上的用户 Delete FROM mysql.user Where user='name' and host='ip';