英语翻译商务英语信函在现今社会中起着重要的交流作用，礼貌原则是商务英语信函写作中要重点把握的技巧。本文通过利奇的礼貌原则

English business letters make a difference of communication in current society.Politeness principles are the skills which should be centering on in the writing of English business letters .This article analyzes the use of politeness principle according to the examples in the English business letters by Lichie's politeness principles .
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The business letters makes important effects in modern society.The principle of manners is the essential skill of business letters writting.According to Lichie's principle of manners,This text analyzed how to use the principle of manners by giving actual examples.