Abstract: All-English and Chinese-English bilingual teaching was once one of the important directions for the reform and development of teaching in science majors such as chemistry in top domestic universities. However, with the rapid development of language-related artificial intelligence technology, changes in the international situation, and the growing demand for academic exchanges in Chinese, bilingual teaching (especially all-English teaching) is facing severe challenges. This paper analyzes the essential attributes of English and Chinese, the actual needs of different types of students, and the role of language in ideological and political education, discusses the positioning and role of Chinese and English teaching in bilingual chemistry courses, and provides references for the optimization of bilingual teaching models.

Key words: Chemistry courses, Bilingual teaching, Role and proportion in Chinese and English teaching