你只要会操作SQL语句就行了，数据库mysql里面有个user表，查看user="root"的记录，把host不为localhost的都删除就可以了。
一般另外一条记录的host为%
我本打算在我的服务器执行一下，把结果给你看，但是我的服务器上已经没用了远程root用户，我执行的过程如下：
E:\mysql5.0.51a\bin>mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 41
Server version: 5.0.51a-community-log MySQL Community Edition (GPL)
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> use mysql
Database changed
mysql> select host,user from user where user="root";
+-----------+------+
| host | user |
+-----------+------+
| 127.0.0.1 | root |
| localhost | root |
+-----------+------+
2 rows in set (0.02 sec)
如果执行上面的语句，你发现了远程root用户，那么你可以用下面的语句删除它：
delete from user where user="root" and host!="localhost";
