$args = array(    'meta_key' => 'sort',    'orderby'   => 'meta_value_num',  // 须 WordPress 2.8 及以上版本    
'order' => DESC
);$arms = array_merge($args, $wp_query->query);query_posts($arms);while (have_posts())//循环内容endwhile;wp_reset_query();

但是有时候我们可能会碰到更加复杂的情况，需要对两个自定义字段进行组合排序，方法如下：

$query = "SELECT wposts.*, wpostmeta1.*, wpostmeta2.* 
FROM $wpdb->posts wposts, $wpdb->postmeta wpostmeta1, $wpdb->postmeta wpostmeta2
WHERE wposts.ID = wpostmeta1.post_id
AND wposts.ID = wpostmeta2.post_id
AND wpostmeta1.meta_key = 'date'
AND wpostmeta2.meta_key = 'time'
ORDER BY wpostmeta1.meta_value ASC,
wpostmeta2.meta_value ASC";$results = $wpdb->get_results($query);foreach ( $results as $result ) {         //循环内容}