1.Introduction In this thesis,it mainly studies High school English teachers’use of euphemismin English class from the perspective of pragmatics of politeness principle;the article will expound the function of euphemism between teachers and students in the classroom communication.Politeness is a key factor for communicating smoothly and it can express some 1. Introduction Introduction of the thesis, it mainly studies High school English teachers’ use of euphemismin English class from the perspective of pragmatics of politeness principle; the article will expound the function of euphemism between teachers and students in the classroom communication. Politeness is a key factor for communicating smoothly and it can express some