[eluser]maomaode[/eluser]
OK, I've solved the problem, the problem is that, the libmysql.dll have to copied to the system32 folder, mysql version is 5.0.45, I guess this is kind of sucks, but, you have to DO that, it's probably the license problem if you have to work with mysql 5.0.45 and PHP 5.2.3.
AND remember to restart the apache2, otherwise it'll take effect!
I just forgot that, after I reinstall the Vista