本文针对二语习得领域内的语言学习关键期研究作一简要综述,简述了国外学者在该领域的理论探索和实证性研究。回顾了二语习得关键期理论的产生和发展,主要从赞成与反对两方面探讨了关键期假设存在的理论依据。 This article gives a brief overview of the critical period of language learning in the field of second language acquisition, and briefly describes the theoretical and practical research of foreign scholars in this field. After reviewing the emergence and development of critical period theory of second language acquisition, this paper mainly discusses the theoretical basis of the existence of critical period hypotheses from both pros and cons.