From the perspective of the social attribute of language creation,the social conventions of language use and the restriction of the non-linguistic environment,to expound the cultural attributes of foreign language education do.

According to Verschueren,natural languages have three major characteristics: linguistic reality,social convention and psychological motive.

This paper will study code-switching from an entirely new approach, namely the adaptation approach and the author finally draw a conclusion that code-switching is a kind of language phenomenon adaptive to linguistic reality?social convention and psychological motive.

This paper tries to analyze the function of Chinese-English code-switching on campus and points out that it is adaptive to linguistic reality、social conventions and mental motivation.

After discussing briefly the basic properties as well as aspects of linguistic adaptation,the paper focuses on the explanation of the choice of indirectness in order to adapt to the communicative goals in the three common factors in almost all cultures,that is,linguistic reality,social conventions and psychological motivations.

Based on the relevance-adaptation model,this paper aims to discuss the communicator s adaptation to social conventions and psychological motivations in the process of using euphemism.

Gumperz clearly explained the realization of discourse in Discourse Strategies by following the contextualization cues, which was the premise of the conventions theory.