Abstract:With the advancement of internationalization in the economy and trade and the rapid development in information technology, great changes of communicative approach in international business have taken place dramatically, which makes available to business interaction successfully. Effective written communication is viewed as one of the most important and valued skills in business and the most common use of this skill is a business letter. More importantly, it is of great value to study principles and master some skills of business writing. This thesis attempts to search some effective ways to help people learn how to write business letters, on the basis of their principles and skills. For one thing, the author presents important principles which embody courtesy, clearness, conciseness, correctness, completeness and coherence. For another, the skills of business writing, such as arrangement of content, use of word and syntactical structure will be analyzed. The decency and rationality of business writings are clearly presented by means of detailed analysis and comments.　　

Key Words: business writing; principles; skills; decency; rationality

摘要:随着经济贸易领域国际化进程的不断加深，以及信息技术领域科学技术的飞速发展，国际商务的沟通方式发生了巨大的变化。有效的书面交流在商界中被视为一项重要且宝贵的技能，而这种技能最普遍的方式是体现在商务信函写作之中。因此，学习商务信函的原则与掌握其技巧尤为重要。本文试图通过分析商务信函的原则与技巧，从而帮助人们找到商务信函写作的有效方法。全文首先陈述商务信函的几项重要原则，它具体包括礼貌原则、清晰原则、简洁原则、正确原则、完整原则、连贯原则等。然后分析了商务信函的技巧，如内容布局、用词及句式。通过具体的商务信函实例以及详细的评述，文章清晰地展示了商务信函的得体性与合理性。

关键词：商务信函；原则；技巧；得体；合理