语言是社会交际和传递信息的工具。但是语言的交际功能只有在特定的语言环境中才能实现，可以说，适应语境是提高语言表达效果的一个基本原则。本文就语境在语言交际和外语教学中的作用做一些讨论。 Language is a tool for social communication and information transmission. However, the communicative function of language can be realized only in a specific language environment. It can be said that adaptation to context is a basic principle to improve the effect of language expression. This article discusses the role of context in language communication and foreign language teaching.