主语和主位是系统功能语法的两个基础概念,但不同的语法流派对于它们有不同的诠释,导致在语法教学和研究方面出现分歧,甚至产生负面影响。因此,分析和研究主语和主位这两个概念在语篇中的对应和非对应关系,通过具体语篇实例,结合外语教学,从传统语法和系统功能语法的视角,指出主语和主位在语法教学和研究方面科研和实用价值。 Subject and Theme are the two basic concepts of system functional grammar, but different grammar schools interpret them differently, resulting in disagreements and even negative impacts on grammar teaching and research. Therefore, this paper analyzes and studies the correspondence and non-correspondence between the two concepts of the subject and the thematic position in the discourse, and from the perspective of the traditional grammar and system functional grammar, Grammar teaching and research research and practical value.