将下面这段代码加入到httpd.conf里
SetEnvIfNoCase Referer "^[url]http://www[/url].xmlchina.org/" local_ref=1
SetEnvIfNoCase Referer "^$" local_ref=1 #允许空referer
<FilesMatch ".(mid|rm|rmi|wma|mp3|flv)">
Order Allow,Deny
Allow from env=local_ref
Allow from 127.0.0.1
</FilesMatch>