语码转换是外语教学普遍存在的现象,本文以语码转换的类型和功能等语言学理论为指导,采用Q方法,对蒙古族英语教师课堂教学语码转换问题做初步研究。研究发现,蒙古族英语教师语码转换主要的类型及功能,并认为语码的选择决定于教师的语言水平、语言自我评价态度以及“目标语学习”的语言习得观念等。 Code-switching is a ubiquitous phenomenon in foreign language teaching. Based on linguistic theories such as the type and function of code-switching, this paper uses the Q method to make a preliminary study on the problem of the code-switching of Mongolian English teachers in classroom teaching. It is found that the choice of code depends on the language proficiency of teachers, attitudes toward language self-assessment and the language acquisition concepts of “target language learning”.