how to limit IE can only visit some websites?

Hello yxq,

Using these in combinaton may be able to help with this:

Hosts File : Use in Windows 7 / Vista

Internet Explorer Content Advisor - Allow or Block Specific Websites

Internet Explorer Content Advisor - Allow or Block Unrated Websites

Internet Explorer Content Advisor - Change Ratings Level

Hope this helps,
Shawn

Note that the use of content advisor doesn't actually "block" the site - it still renders (invisible window), and CA checks the content to see if it is allowed or not. So, if you're blocking sites due to malware/virus concerns, this is *not* a good way to do it. At that point, using a hosts file will work, but it may be better to use a proxy autoconfig script. The script itself isn't the easiest to create, but you can whitelist some sites (or domains), and block everything else (whereas a host file is more of a blacklist, and needs to be continuously updated).

Including the link to my blog previously, Technet has a whole host of information about it.

Using Automatic Configuration, Automatic Proxy, and Automatic Detection

Appendix B: Auto-Proxy Configuration Script Examples