你必须让你的网站类别与你的theme categories 文件夹名称。

以下是如何筛选主题：Hide a theme on list of themes in wp-admin without editing core files

然后，假设一个站点有a-p 主题存储在themes/a-p/, 这将过滤掉它们：

add_filter( \'all_themes\', \'remove_themes_ms_wpse_117537\' );

function remove_themes_ms_wpse_117537( $themes )
{
    if( \'site-themes-network\' != get_current_screen()->id )
        return $themes;

    $site_cat = get_blog_option( absint( $_GET[\'id\'] ), \'site_category\' );
    if( $site_cat )
    {
        # Unset themes not in the folder /themes/$site_cat/
        foreach( $themes as $key => $theme )
        {
            if( strpos( $key, "$site_cat/" ) === false )
                unset($themes[$key]);
        }
    }
    return $themes;
}