本文介绍韩礼德的功能语法中的语法隐喻,重点分析语法隐喻中概念隐喻与人际隐喻的名词化,语气隐喻和情态隐喻。并分别探讨了它们的语篇衔接功能。衔接是语篇连贯有意义的重要手段,说明这种常见的语言表达现象——语法隐喻的运用实现了一定的语篇功能,是一种组篇工具。 This article introduces Halliday’s grammatical metaphor in functional grammar, focusing on the analysis of nominal metaphor and nominal metaphor, modal metaphor and modality metaphor in grammatical metaphor. And discussed their discourse cohesion function respectively. Cohesion is an important means of textual coherence and significance. It shows that this kind of common language expression phenomenon - the application of grammatical metaphor realizes certain textual functions and is a grouping tool.