| Acknowledgments | 第1-4页 |
| Abstract in Chinese | 第4-5页 |
| Abstract in English | 第5-7页 |
| Part Ⅰ Introduction | 第7-17页 |
| 1．1 Language and communication | 第7-8页 |
| 1．2．1 International business communication by letter | 第7页 |
| 1．2．2 The importance of international business letters | 第7-8页 |
| 1．2．3 English language and international business communication | 第8页 |
| 1．3 Politeness and Politeness Principle of pragmaties | 第8-17页 |
| 1．3．1 What's politeness? | 第8页 |
| 1．3．2 Face, positive face and negative face | 第8-9页 |
| 1．3．3 Positive and negative politeness | 第9页 |
| 1．3．4 Politeness Principle of pragmatics and international business letters communicating pleasant and unpleasant news | 第9-17页 |
| Part Ⅱ Politeness Principle of pragmatics and pleasant-news international business letters | 第17-27页 |
| 2．1 What are pleasant-news international business letters? | 第17页 |
| 2．2 The language characteristics of pleasant-news international business letters | 第17-20页 |
| 2．3 The sequence of ideas of pleasant-news international business letters | 第20页 |
| 2．4 Kinds of pleasant-news international business letters | 第20-27页 |
| Part Ⅲ Politeness Principle of pragmatics and unpleasant-news business letters | 第27-42页 |
| 3．1 What are unpleasant-news international business letters? | 第27页 |
| 3．2 The language characteristics of international business letters? | 第27-34页 |
| 3．3 The sequence of the ideas of unpleasant-news international business letters | 第34-36页 |
| 3．4 Kinds of unpleasant-news international business letters | 第36-42页 |
| Part Ⅳ Conclusion | 第42-44页 |
| Bibliography | 第44-45页 |
