近年来有关语篇分析的研究越来越多。本文以语篇分析为工具,对埃德加?爱伦?坡的经典小说《泄密的心》中的高潮部分进行了分析。在分析了这一部分的主位推进过程之后,从其选用的主位推进模式入手对文章进行了赏析,体现了不同的主位推进模式对文章的作用。并从系统功能语法的角度对文章的语境等特点进行了分析。 In recent years, more and more studies on discourse analysis. This article uses discourse analysis as a tool to analyze the climax of Edgar Allan Poe’s classic novel, The Heart of Thieves. After analyzing the thematic progression of this section, we start with an appreciation of the selected thematic progression mode, which shows the different modes of thematic progression. And from the perspective of system function grammar, this paper analyzes the context of the article and other characteristics.