| Contents | 第1-7页 |
| Abstract | 第7-9页 |
| 摘要 | 第9-10页 |
| List of Figures and Tables | 第10-11页 |
| Chapter One Introduction | 第11-17页 |
| ·Research Background | 第11-13页 |
| ·Research Purpose and Significance | 第13-15页 |
| ·The Overall Organization of the Research | 第15-17页 |
| Chapter Two Literature Review | 第17-31页 |
| ·Definitions of Probability and Frequency | 第17页 |
| ·Theoretical Foundation of Probability and Frequency | 第17-22页 |
| ·Probability and Frequency of Systematic Functional Linguistics | 第17-18页 |
| ·Probability and Frequency of Probabilistic Linguistics | 第18-19页 |
| ·Probability and Frequency of Psycholinguistics | 第19-21页 |
| ·Probability and Frequency of Corpus Linguistics | 第21-22页 |
| ·Measuring Method of Lexical Frequency Profile | 第22-25页 |
| ·Previous Studies of Productive Vocabulary Breadth and English Writing | 第25-28页 |
| ·Studies of Productive Vocabulary Breadth and English Writing Abroad | 第25-26页 |
| ·Studies of Productive Vocabulary Breadth and English Writing at Home | 第26-28页 |
| ·Current Research Status of Productive Vocabulary Breadth in English Writing | 第28-31页 |
| Chapter Three Research Methodology | 第31-36页 |
| ·Research Questions | 第31页 |
| ·Subjects | 第31-32页 |
| ·Instruments | 第32-34页 |
| ·English Writing | 第32-33页 |
| ·Range | 第33-34页 |
| ·SPSS 13.0 | 第34页 |
| ·Data Collection and Analysis | 第34-36页 |
| Chapter Four Results and Discussion | 第36-64页 |
| ·Non-English Majors’ Productive Vocabulary Breadth | 第37-51页 |
| ·Productive Vocabulary Breadth of High Score Group | 第40-41页 |
| ·Productive Vocabulary Breadth of Medium Score Group | 第41页 |
| ·Productive Vocabulary Breadth of Low Score Group | 第41-51页 |
| ·Differences in Productive Vocabulary Breadth among Three Groups | 第51-58页 |
| ·Differences in Lexical Variation | 第51-54页 |
| ·Differences in Lexical Sophistication | 第54-58页 |
| ·The Influence of Productive Vocabulary Breadth on English Writing | 第58-64页 |
| ·The Influence of Lexical Variation on English Writing | 第60-61页 |
| ·The Influence of Lexical Sophistication on English Writing | 第61-64页 |
| Chapter Five Conclusion | 第64-69页 |
| ·Major Findings | 第64-65页 |
| ·Pedagogical Implications | 第65-66页 |
| ·Limitations of the Study | 第66-67页 |
| ·Suggestions for Further Research | 第67-69页 |
| Bibliography | 第69-76页 |
| Appendix Ⅰ Writing | 第76-77页 |
| Appendix Ⅱ CET-4 Scoring Principles and Rating Standards | 第77-78页 |
| Appendix Ⅲ Kendall Coefficient of Concordance | 第78-79页 |
| Appendix Ⅳ Ebbinghaus’ Forgetting Curve | 第79-80页 |
| Appendix Ⅴ Jacobs et al.’s Vocabulary Scale from ESL Composition Profile | 第80-81页 |
| Published Paper | 第81-82页 |
| Acknowledgements | 第82页 |
