摘要：As early as the 19th century,historical comparative linguists found the cross-linguistic influence in the study of language communication.In the second language acquisition process,the use of the mother tongue is also affected by the second language.In terms of phonetics,the influence of the second language is more subtle,however in lexical,syntax,the influence of the second language is easier to observe.But both have the transition to the characteristics of the sec ond language.In r ecent years,some scholars have made their eff orts to study the influence of second language on mother tongue from the syntax.All these r esearchers improve people’s understanding of this influence.However this paper will focus on the level of lexical,the mother tongue users use politeness principles and cooperative principles to express their intentions,for instance,the localization of foreign words and the fusion of language.Some reflect the language assimilation and cultural assimilation and the spoken language feature of the second language is still used when the grammar is not allowed in their mother tongue,for instance,literally,absolutely,anyway,apparently.And the frequent use of the second language makes it impossible to find the proper word or slightly stiff in the mother tongue at final.This paper will analyze specific phenomenon in terms of lexical in order to illustrate the influence of second language acquisition on mother tongue users.

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