| Acknowledgements | 第1-6页 |
| 摘要 | 第6-7页 |
| Abstract | 第7-10页 |
| Abbreviations | 第10-13页 |
| Chapter One Introduction | 第13-16页 |
| ·Background | 第13-14页 |
| ·Significance and Purpose of the Study | 第14-15页 |
| ·Organization of the Thesis | 第15-16页 |
| Chapter Two Literature Review | 第16-27页 |
| ·The Previous Studies on Appraisal Theory | 第16-19页 |
| ·The Previous Studies on Appraisal Theory at Home | 第16-18页 |
| ·The Previous Studies on Appraisal Theory Abroad | 第18-19页 |
| ·The Previous Studies on Critical Discourse Analysis and Positive Discourse Analysis | 第19-22页 |
| ·The Previous Studies on Critical Discourse Analysis | 第19-21页 |
| ·The Previous Studies on Positive Discourse Analysis | 第21-22页 |
| ·The Previous Studies on Systemic Functional Linguistics | 第22-24页 |
| ·The Previous Studies on News Discourse | 第24-25页 |
| ·Summary | 第25-27页 |
| Chapter Three Theoretical Framework | 第27-37页 |
| ·Appraisal Theory | 第27-34页 |
| ·Attitude system | 第28-31页 |
| ·Engagement system | 第31-33页 |
| ·Graduation | 第33-34页 |
| ·The Relationship between Positive Discourse Analysis and Critical Discourse Analysis | 第34-35页 |
| ·Analytical Framework of the Present Study | 第35-37页 |
| Chapter Four Methodology | 第37-39页 |
| ·Research Questions | 第37页 |
| ·Data Collection | 第37-38页 |
| ·Research Method | 第38-39页 |
| Chapter Five Positive Discourse Analysis in Accident Report Discourse | 第39-57页 |
| ·Positive Discourse Analysis in Accident Report Discourse from the Perspective ofAttitude Sub-System | 第39-45页 |
| ·Positive Discourse Analysis in Affect of Attitudinal Resources | 第40-41页 |
| ·Positive Discourse Analysis in Judgement of Attitudinal Resources | 第41-42页 |
| ·Positive Discourse Analysis in Appreciation of Attitudinal Resources | 第42-44页 |
| ·Summary | 第44-45页 |
| ·Positive Discourse Analysis in Accident Report Discourse from the Perspective ofEngagement Sub-System | 第45-53页 |
| ·Positive Discourse Analysis in Mono-glossia of Engagement Resources | 第47-48页 |
| ·Positive Discourse Analysis in Hetero-glossia of Engagement Resources | 第48-53页 |
| ·Summary | 第53页 |
| ·Positive Discourse Analysis in Accident Report Discourses from the Perspective ofGraduation Sub-System | 第53-57页 |
| ·Positive Discourse Analysis in Force of Graduation Resources | 第54-55页 |
| ·Positive Discourse Analysis in Focus of Graduation Resources | 第55-56页 |
| ·Summary | 第56-57页 |
| Chapter Six Conclusion | 第57-60页 |
| ·Major Findings of the Study | 第57-58页 |
| ·Implications of the Study | 第58页 |
| ·Limitations and Suggestions for the Further Study | 第58-60页 |
| Bibliography | 第60-63页 |
| Appendix: Sample Discourse | 第63-66页 |
| 在校期间的研究成果及发表的学术论文 | 第66页 |
