作为与外商沟通与谈判的书面方式,专业高效的商务英语函电能够有效地促成经贸交流和合作。对当前学生在商务英语函电写作中存在的问题进行了分析,归纳总结了专业的商务英语函电的五个语言特征,论述了如何按照5C’s Principles(5C’s原则)提高学生商务英语书面沟通与交流的技能、写出高效专业的商务英语函电。 As a written way to communicate and negotiate with foreign businesses, professional and efficient business correspondence can effectively promote economic and trade exchanges and cooperation. This paper analyzes the current problems in the business English correspondence writing and summarizes the five language features of the professional business English correspondence and discusses how to improve students’ written communication and exchange skills in business English according to 5C’s Principles , Write efficient and professional business English correspondence.