I'm sorry, the official driver of ATI is just woking!!!
Here is a solution: http://blog.jasondonenfeld.com/190
I tried to make install xorg-server, but it seems not working.
(Download from:http://xorg.freedesktop.org/releases/individual/xserver/)
I change the source code as mentioned above..But why?
Should I make install all of xorg??(I just made install xorg-server only)