| Acknowledgements | 第6-7页 |
| Abstract | 第7-8页 |
| 摘要 | 第9-13页 |
| Chapter 1 Introduction | 第13-15页 |
| Chapter 2 Literature Review | 第15-37页 |
| 2.1 Brief Introduction of Second Language Vocabulary Research | 第15-28页 |
| 2.1.1 General Development of Research on Vocabulary Acquisition | 第15-17页 |
| 2.1.2 Various Measurement of Lexical Knowledge | 第17-28页 |
| 2.2 Attention to L2 Proficiency as a Research Discipline | 第28-32页 |
| 2.2.1 The Theory of Language Competence | 第28-31页 |
| 2.2.2 Proficiency of Language | 第31-32页 |
| 2.3 Previous Experimental Studies on Productive Vocabulary | 第32-37页 |
| 2.3.1 Review of the Empirical Research | 第32-35页 |
| 2.3.2 Review of the Research on the Correlation between Vocabulary and Language Proficiency | 第35-37页 |
| Chapter 3 Methodology | 第37-43页 |
| 3.1 Research Questions | 第37页 |
| 3.2 Subjects | 第37-38页 |
| 3.3 Data Collection | 第38-42页 |
| 3.3.1 Compositions of the Subjects | 第38-39页 |
| 3.3.2 Language Proficiency Test | 第39-42页 |
| 3.4 Data Analysis | 第42-43页 |
| 3.4.1 Measurement of Lexical Richness: Lexical Frequency Profile | 第42页 |
| 3.4.2 Statistic Instrument for Correlation Analysis:SPSS 13.0 | 第42-43页 |
| Chapter 4 Results and Findings | 第43-53页 |
| 4.1 The Results of Lexical Richness Analysis | 第43-45页 |
| 4.2 The Results of Language Proficiency Test | 第45-47页 |
| 4.3 The Correlation between Lexical Richness and Performance in Test | 第47-52页 |
| 4.3.1 The Result of Pearson Correlation between Productive Vocabulary and Language Proficiency | 第48-51页 |
| 4.3.2 The Result of Linear Regression | 第51-52页 |
| 4.4 Summary | 第52-53页 |
| Chapter 5 Discussion and Implications | 第53-61页 |
| 5.1 The Cause of Weak Correlation between Language Proficiency and Productive Vocabulary | 第53-56页 |
| 5.1.1 Validity and Reliability of the Language Proficiency Test | 第53-54页 |
| 5.1.2 The Homogenous Language Proficiency Level the Subjects | 第54-56页 |
| 5.2 The Individual Difference among the Subjects | 第56-59页 |
| 5.2.1 Negative Growth | 第56-57页 |
| 5.2.2 Fossilization in Proficiency Level | 第57-59页 |
| 5.3 Implications for Further Research | 第59-61页 |
| 5.3.1 Some Suggestions to Methodology | 第59-60页 |
| 5.3.2 Implications in Language Teaching | 第60-61页 |
| Chapter 6 Conclusion | 第61-62页 |
| Reference | 第62-66页 |
