The fundamental purpose of learning English is to develop language communication skills.Whether language expressing is ap-propriate or not,which is an important content to take measure the level of communicative competence.Therefore,people should not only understand the knowledge of communication skills,but also should learn and develop pragmatic competence and pragmatic knowledge in English communication,that is,appropriate language expressing.So,from the usage of politeness principle in Chinese and British coun-tries,the writer researches into the origin and evolution of politeness principle ,and focuses on the differences of application between Brit-ish and Chinese culture ,in order to help English learners understand the differences of Chinese and British culture well,and the proper use of politeness principle to communicate.