四川少数民族聚居区多语言环境下的少数民族学生英语教学很容易受母语、汉语等语言的影响,这样一来也会对英语教学产生较大的影响。三语习得作为一个比较新的语言学研究课题,已经逐步发展成语言习得领域研究关心的一个重要领域。本文阐述了三语习得的基本含义,论述了三语习得理论,分析了三语习得理论下的四川少数民族聚居区多语言环境英语教育现状,并提出了以三语习得理论为基础提高四川少数民族聚居区多语言环境下英语教育质量的对策。 The English teaching of ethnic minority students in multi-lingual environments inhabited by ethnic minority groups in Sichuan is easily influenced by mother tongue, Chinese and other languages, which in turn will have a greater impact on English teaching. As a relatively new linguistic research topic, the acquisition of English as a third language has gradually developed into an important area of ​​concern in the field of language acquisition. This article expounds the basic meaning of the acquisition of the three languages, expounds the theory of the acquisition of the three languages, analyzes the present situation of the English education in multi-lingual environment inhabited by ethnic minorities in Sichuan under the theory of the three-language acquisition, Countermeasures to Improve English Education Based on Multi - lingual Environment inhabited by Ethnic Minorities in.