看看你的virtual host是不是有这个错误：
引用
<Directory "/home/page_url/www/">
AllowOverride None
AllowOverride None
你要去掉AllowOverride None. 如果 apache版本较低，还要加上AllowOverride All
引用
Syntax: AllowOverride All|None|directive-type [directive-type] …
Default:AllowOverride None (2.3.9 and later), AllowOverride All (2.3.8 and earlier)
http://stackoverflow.com/questions/5210820/apache-server-ignores-htaccess