ContentsAbstract in English ……………………………………………………………………4Abstract in Chinese …………………………………………………………………41. Introduction ………………………………………………………………………52.Politeness ……………………………………………………………………………52.1 The Definition of Politeness ……………………………………………………52.2 Politeness Principle (PP) and Its Maxims ………………………………………62.2.1 Tact Maxim ……………………………………………………………………62.2.2 Generosity Maxim ……………………………………………………………72.2.3 Approbation Maxim……………………………………………………………92.2.4 Modesty Maxim ………………………………………………………………92.2.5 Agreement Maxim……………………………………………………………102.2.6 Sympathy Maxim ……………………………………………………………103.Politeness and Personal Letters ……………………………………………………123.1.Components of Personal Letters ………………………………………………123.2.Representation of Politeness in Personal Letters ……………………………133.2.1Greeting Types………………………………………………………………133.2.2 Gender Types ………………………………………………………………143.2.3 Intrinsic types ………………………………………………………………144. Politeness and Business Letters ……………………………………………………154.1 Business English letters …………………………………………………………154.1.1 Field …………………………………………………………………………154.1.2 Tenor …………………………………………………………………………164.1.3 Mode …………………………………………………………………………164.2.Classification of Business English letters ………………………………………174.3.Representation of Politeness in Business Letters ………………………………18 4.3.1 Vocabulary Choosing and Politeness of Business English Letters……………18 4.3....