| Abstract in English | 第1-6页 |
| Abstract in Chinese | 第6-9页 |
| Chapter One Introduction | 第9-12页 |
| Chapter Two Vagueness in Language | 第12-18页 |
| ·Introduction | 第12-13页 |
| ·Definition of Vagueness | 第13-16页 |
| ·Fuzzy Set and Its Development | 第16-18页 |
| Chapter Three Forensic Linguistics | 第18-27页 |
| ·The Founding Review of Forensic Linguistics | 第18-19页 |
| ·The Definition of Forensic Linguistics | 第19-20页 |
| ·The Main Branches of Forensic Linguistics | 第20-22页 |
| ·The Education of Forensic Linguistics | 第22-24页 |
| ·Forensic Linguistics Education in Western Countries | 第22-23页 |
| ·Forensic Linguistics Education in China | 第23-24页 |
| ·Vagueness in Forensic Language | 第24-27页 |
| Chapter Four Comparison on Semantic Perspective | 第27-47页 |
| ·Vagueness Caused by Connotation and Denotation | 第27-29页 |
| ·Vagueness Caused by Polysemy | 第29-31页 |
| ·Vagueness Caused by Hyponymy | 第31-32页 |
| ·Vagueness Caused by Indicating Inexplicitly | 第32-33页 |
| ·Vagueness Caused by the Word Meanings' Changes | 第33-35页 |
| ·Vagueness Caused by Borderline Cases | 第35-47页 |
| ·Continuous Variation | 第36-39页 |
| ·Noun Classifications | 第39-44页 |
| ·Names Express Unity | 第44-47页 |
| Chapter Five Comparison on Pragmatic Perspective | 第47-60页 |
| ·Brief Introduction of Cooperative Principle | 第47-49页 |
| ·Brief Introduction of Politeness Principle | 第49-51页 |
| ·The Research with CP and PP | 第51-60页 |
| ·Power and Politeness | 第51-53页 |
| ·Using Language Persuasively | 第53-54页 |
| ·Lacking Specific Information | 第54-57页 |
| ·Intentionally Withholding Information | 第57-60页 |
| Chapter Six Differences in Vagueness and its Reasons | 第60-66页 |
| ·Culture Differences | 第61-62页 |
| ·Precision and Vagueness-the Style of Language | 第62-66页 |
| Chapter Seven Conclusion | 第66-69页 |
| ·Summary of the Thesis | 第66-67页 |
| ·Implication of the Research | 第67页 |
| ·Limitations and Recommendations | 第67-69页 |
| Acknowledgements | 第69-70页 |
| References | 第70-72页 |
