Abstract: With the development of China’s economy, interaction between China and foreign countries is becoming frequent. Business English correspondence is widely used in our daily life and routine duties，especially the correspondence for claims. In this paper, the author wants to tell people the application of Politeness Principle in business English correspondence for claims. First，it starts from the introduction to the business English correspondence，talking about the definition and functions. In the following parts, it introduces the basic theory of Politeness Principle, and explains the maxims of Politeness Principle in business English letters for claims. And then it talks about application of Politeness Principle. This thesis tries to reveal many linguistic features of business English correspondence for claims on the basis of Politeness Principle, aiming to tell businessmen how to write business English letters for claims properly, furthermore, and to make the business communication fulfilled smoothly and even doing well to the business transaction among our country and foreign countries.

Key words：Politeness Principle (PP), business English correspondence, claim, application

摘要：随着中国经济的发展，中国与外国交往越来越密切。商务英语信函被广泛应用于人们日常生活的各个领域,特别是商务信函中的索赔信。当人们写索赔信的时候，需要特别注意礼貌原则及其运用。这篇论文阐述了礼貌原则在商务英语索赔信中的具体运用。首先，介绍商务英语信函的概念及其功能。其次，介绍礼貌原则的基本概念，并解释礼貌原则在商务英语信函中的意义。在礼貌原则基础上揭示商务信函索赔信的语言特点的同时，为人们提供正确、恰当的商务英语索赔信的写作策略，从而使商务交际顺利进行。

关键词：礼貌原则；商务英语信函；索赔；运用