您可以使用save_post 像这样钩住：

function set_post_parent_on_save($post_id) {
    // If this is just a revision, don\'t do anything
    if ( wp_is_post_revision( $post_id ) )
        return;

    // Check if it is a post
    if ( \'post\' == get_post_type( $post_id ) ) {
        // unhook this function so it doesn\'t loop infinitely
        remove_action( \'save_post\', \'set_post_parent_on_save\' );

        // update the post, which calls save_post again
        wp_update_post( array(
            \'ID\' => $post_id,
            \'post_parent\' => 88 // <- or whatever the parent should be
        ) );

        // re-hook this function
        add_action( \'save_post\', \'set_post_parent_on_save\' );
    }
}
add_action( \'save_post\', \'set_post_parent_on_save\' );