本文以《空中骑士》与《一个战争片段》两部反应美国内战的短篇小说为例,介绍了一种通过寻找原作写作共性的相反特性来探究作品间主题共性的新方法,从而解决了被比较作品间主题共性模糊,同时存有相似写作特征但无法从中直接获取主题信息情况。通过对“镜面特征”的寻找,得出了两部作品“对传统英雄主义进行颠覆与讽刺”的主题共性。 Taking the short stories of “Air Knight” and “A War Fragment” that reflect the civil war in the United States as an example, this article introduces a new method to explore the theme commonality between works by looking for the opposite characteristics of the original writing commonality, The common themes of the works are obscure, and there are similar writing features but no direct access to thematic information. Through the search for the “mirror feature”, we come to the similarities and differences between the two works “subversion and satire” of traditional heroism.