经过一些研究，我想

function set_post_order_in_admin( $wp_query )
{
    if ( is_admin() )
    {
        $wp_query->set( \'orderby\', \'modified\' );
        $wp_query->set( \'order\', \'ASC\' );
    }
}
add_filter(\'pre_get_posts\', \'set_post_order_in_admin\' );