克拉申第二语言习得理论指出第二语言习得理论有五个假设组成,对语言习得过程进行了理论化、系统化的研究,是目前世界上影响最大的语言学理论之一。本文介绍了克拉申第二语言习得理论的构成、假设,分析了克拉申第二语言习得理论的重要意义。 Krashen’s second language acquisition theory points out that there are five hypotheses in SLA theory, and theorizing and systematizing the process of language acquisition is one of the most influential linguistic theories in the world at present. This article introduces the composition of Krashen’s second language acquisition theory, hypotheses, and analyzes the significance of Krashen’s second language acquisition theory.