The paper explores the use of ChatGPT in developing a professional English course for university students, specifically focusing on Law English. The authors describe a real case study where ChatGPT was utilized to create a curriculum, syllabus, and textbook for a course on "Foreign Language Studies" at the Master's level in Law. The methods employed include analysis, synthesis, case study, and expert assessment. The results show that ChatGPT can generate content, texts, tasks, and tests, enhancing the efficiency and effectiveness of the course development process. However, the authors emphasize that while ChatGPT is a valuable tool, it should be used in conjunction with human oversight to ensure accuracy, relevance, and appropriateness. The paper concludes that ChatGPT can significantly contribute to the development of professional English courses, but it is important to balance its use with human guidance to maintain educational quality and integrity.The paper explores the use of ChatGPT in developing a professional English course for university students, specifically focusing on Law English. The authors describe a real case study where ChatGPT was utilized to create a curriculum, syllabus, and textbook for a course on "Foreign Language Studies" at the Master's level in Law. The methods employed include analysis, synthesis, case study, and expert assessment. The results show that ChatGPT can generate content, texts, tasks, and tests, enhancing the efficiency and effectiveness of the course development process. However, the authors emphasize that while ChatGPT is a valuable tool, it should be used in conjunction with human oversight to ensure accuracy, relevance, and appropriateness. The paper concludes that ChatGPT can significantly contribute to the development of professional English courses, but it is important to balance its use with human guidance to maintain educational quality and integrity.