| Acknowledgements | 第1-4页 |
| Abstract | 第4-6页 |
| 中文摘要 | 第6-8页 |
| Table of Contents | 第8-11页 |
| List of Tables | 第11-12页 |
| Chapter One Introduction | 第12-15页 |
| ·The Background of the Present Study | 第12-13页 |
| ·Significance of the Study | 第13页 |
| ·The Structure of the Thesis | 第13-15页 |
| Chapter Two Literature Review | 第15-30页 |
| ·Some Basic Concepts related to the Study | 第15-19页 |
| ·Mental Lexicon | 第15-17页 |
| ·Paradigmatic Relations and Syntagmatic Relations | 第17-18页 |
| ·Phonological Knowledge | 第18页 |
| ·Frequency | 第18-19页 |
| ·The Theoretical Framework for this Study | 第19-23页 |
| ·Semantic Field | 第19-20页 |
| ·Organization of the Mental Lexicon | 第20-22页 |
| ·Frequency Effect | 第22-23页 |
| ·A Review of Previous Studies | 第23-29页 |
| ·Previous Studies on the Organization of L2 Mental Lexicon | 第23-25页 |
| ·Previous Studies on Frequency Effect | 第25-27页 |
| ·Previous Studies on English Writing | 第27页 |
| ·Words' Frequency Effect and Semantic Association | 第27-28页 |
| ·The Organization of L2 Mental Lexicon and the Level of English Writing | 第28-29页 |
| ·Summary | 第29-30页 |
| Chapter Three Research Methodology | 第30-36页 |
| ·Research Questions | 第30页 |
| ·Research Design | 第30-36页 |
| ·Participants | 第30页 |
| ·The materials | 第30-33页 |
| ·Procedures | 第33-34页 |
| ·Data Collection | 第34-35页 |
| ·Data Analysis | 第35-36页 |
| Chapter Four Results and Discussion | 第36-48页 |
| ·General Descriptive Statistics | 第36-42页 |
| ·Results of English Writing Task | 第36-37页 |
| ·Results of Word Association Test | 第37页 |
| ·Results of Decision Task of Relations | 第37-40页 |
| ·Results of English Writing and Two Relations | 第40-42页 |
| ·Comparison between High Proficiency Group and Low Proficiency Group | 第42-44页 |
| ·Comparison of Decision Task of Relations | 第42-44页 |
| ·Comparison of English Writing Task | 第44页 |
| ·Comparison between High-speed Reaction Group and Low-speed Reaction Group | 第44-45页 |
| ·Comparison in Syntagmatic Relations | 第44-45页 |
| ·Comparison in Paradigmatic Relations | 第45页 |
| ·Discussion | 第45-47页 |
| ·Discussion about Hypothesis one | 第46-47页 |
| ·Discussion about Hypothesis two | 第47页 |
| ·Summary | 第47-48页 |
| Chapter Five Conclusion | 第48-51页 |
| ·Major Findings of the Study | 第48页 |
| ·Pedagogical Implications for Word Instruction and English Writing | 第48-50页 |
| ·Implications for Word Instruction | 第48-49页 |
| ·Implications for English Writing | 第49-50页 |
| ·Limitations and Suggestions for Further Research | 第50-51页 |
| References | 第51-54页 |
| Appendix Ⅰ:Word Association Test | 第54-56页 |
| Appendix Ⅱ:English Writing Task | 第56-57页 |
| Appendix Ⅲ:ESL COMPOSITION PROFILE | 第57-59页 |
| 攻读学位期间发表的学术论文 | 第59-60页 |
