将代码添加到分类归档模板文件主循环的上面：

<?php
	if ( is_category() ) {
		$this_category = get_category( $cat );
	}
?>
<?php
	if ( $this_category->category_parent )
		$this_category = wp_list_categories( 'orderby=id&show_count=0&title_li=&use_desc_for_title=1&child_of='.$this_category->category_parent."&echo=0" );
	else
		$this_category = wp_list_categories( 'orderby=id&depth=1&show_count=0&title_li=&use_desc_for_title=1&child_of='.$this_category->cat_ID."&echo=0" );
	if ( $this_category ) { ?>
	<ul>
		<?php echo $this_category; ?>
	</ul>
<?php } ?>