摘要

随着全球经济一体化的深入发展，国际贸易正以前所未有的速度快速发展，各国之间在经济上的相互合作和与相互依存度也在不断加深和提高。英语是国际贸易中使用最为普遍的一种交际性语言。商务英语信函则成为各国之间贸易往来的主要方式。商务英语信函在经济领域中已经逐渐成为一种重要的交际手段， 它有传递信息的功能，它还肩负着建立与加强业务联系的重任。商务英语信函的特点与功能决定了在商务英语信函必须注意礼貌原则的适用。因为信函对礼貌具有较高的要求，所有我们有必要研究一下商务英语信函中的礼貌原则的运用。

关键词：商务信函；礼貌原则；运用

Abstract
English is the most common communicative language used in international trade. Business English correspondences have become the main form of communication in international trade among countries. Business English correspondence has gradually become an important means of communication in the economic field. Its function is to transmit information and build up the business relation between countries. The features and function of the business English correspondence determine that we must pay more attention to politeness principles in correspondence. We all need to study the usage of politeness principles in business English correspondence.   

Key words: business English correspondence; politeness principles; application

1. Introduction
With the fast development of globalization, the skills of business communication between countries in the worldwide trade are very significant. Whether trade negotiations succeed or not depends on the use of language. A good communication means will make the trade go smoothly and let both sides obtain the expected results. Therefore it requires both sides to use different strategies to express various opinions and make it easy to let other people accept. During the communication, both sides may try the best to gain their own advantages in the conflict and occupy the dominant position. Using language properly is the key to make the trade cooperation smoothly. The appropriate use of language can reflect the friendship, respect, and understanding from the sender to the receiver. In the meanwhile the strategic use of language enables both sides to achieve efficient communication purpose.
In business, exporters and importers mostly use business letters to contact each other and reach a fair and mutually-beneficial deal. Business letters play an important role no matter in domestic or international trade. It helps build and maintain the harmonious business relationships. It serves as an effective way to exchange information. It is extremely o set the tone correctly in English in the business letters. In international trade, English business correspondence is the most widely used way for both sides to communicate.