主位理论是系统功能语法中语篇功能的重要组成部分。本文以此作为理论基础,通过对语篇的主位和述位、主位推进模式的分析,更好地观察研究语篇的信息分布,从而更准确、全面地理解原文。 The thematic theory is an important part of the discourse function in the system functional grammar. Based on this, this thesis analyzes the distribution of the information in the discourse of discourse through the analysis of the thematic and rheme of the discourse and the mode of thematic proposition, so as to understand the original text more accurately and comprehensively.