重命名portfolio-archive.php 到front-page.php 并在启用筛选器的情况下更改该页面的帖子类型pre_get_posts:

add_filter( \'pre_get_posts\', \'wpse_99860_portfolio_on_front\' );

function wpse_99860_portfolio_on_front( $query )
{
    // not the main loop
    if ( ! $query->is_main_query() )
        return $query;

    // not the front page
    if ( ! $query->is_front_page() )
        return $query;

    $query->set( \'post_type\', array ( \'portfolio\' ) );

    return $query;
}