运用CiteSpace对近十年国内语域研究进行可视化分析，发现“翻译”和“专门用途英语”等关键词呈高频次聚类出现，是领域内重点研究的问题。目前，语域理论在专门用途英语教学中的应用主要集中于论证这一理论对于专门用途英语教学的指导作用。基于系统语言学的语域理论，通过分析和阐释语场、语旨和语式三个变量在专门用途英语教材中的具体体现，揭示语域变量与专门用途英语教材编写范式之间是系统和实例的关系，以期对专门用途英语教材的研究视角和编写理据提供佐证。

With the CiteSpace software, visualized analysis of domestic register studies within ten years indicates that the key words "translation" and "ESP" of high frequency have been the focus. At present, the application of register theory to ESP teaching mainly concentrates on the demonstration of its guiding significance. Based on the register theory, the paper illustrates the embodiment of three variables—field, tenor, and mode—in the ESP textbook and explores the relationship of system and instance between three variables of register and the compilation of ESP textbooks. The study aims to provide a research perspective and the proof for compiling the ESP textbooks.