韩礼德的语域理论是系统功能语法的重要理论之一,它强调语言的交际功能和社会意义。本文分别从词汇语法、阅读和写作三方面对如何将语域知识运用于英语教学实践进行了深入探讨。本文认为,语域理论在英语教学中的应用能促进学生将语言知识转化为语言应用能力。 Halliday’s domain theory is one of the important theories of system functional grammar, which emphasizes the communicative function and social significance of language. This article has carried on the thorough discussion to how to apply the domain knowledge to the English teaching practice from three aspects of vocabulary grammar, reading and writing respectively. This paper argues that the application of Register Theory in English teaching can promote students’ ability to translate language knowledge into language application.