| Abstract | 第3-4页 |
| 摘要 | 第5-9页 |
| Chapter 1 Introduction | 第9-12页 |
| 1.1 Background of the Study | 第9-10页 |
| 1.2 Significance of the Present Study | 第10-11页 |
| 1.3 The Layout of the Thesis | 第11-12页 |
| Chapter 2 Literature Review | 第12-29页 |
| 2.1 Syntactic Complexity in Writing | 第12-16页 |
| 2.1.1 Definitions of syntactic complexity | 第12-13页 |
| 2.1.2 Measures of Syntactic Complexity in Writing | 第13-16页 |
| 2.2 Lexical Complexity in Writing | 第16-17页 |
| 2.2.1 Definition of Lexical Complexity | 第16-17页 |
| 2.2.2 Measures of Lexical Complexity | 第17页 |
| 2.3 Dynamic Systems Theory | 第17-19页 |
| 2.3.1 Complete interconnectedness | 第18页 |
| 2.3.2 Nonlinear Development | 第18页 |
| 2.3.3 Self-organization and attractor states | 第18-19页 |
| 2.3.4 DST in Language Complexity | 第19页 |
| 2.4 Research on Syntactic Complexity in Writing | 第19-25页 |
| 2.4.1 the Relationship between Syntactic Complexity and WritingProficiency | 第19-21页 |
| 2.4.2 the Relationship between Syntactic Complexity and Genres | 第21-23页 |
| 2.4.3 the Relationship between Syntactic Complexity and School Grades | 第23-25页 |
| 2.5 Research on Lexical Complexity in Writing | 第25-28页 |
| 2.5.1 Research on Lexical Complexity in Writing at Abroad | 第25-26页 |
| 2.5.2 Research on Lexical Complexity in Writing at Home | 第26-28页 |
| 2.6 Summary | 第28-29页 |
| Chapter 3 Research Methodology | 第29-34页 |
| 3.1 Research Questions | 第29页 |
| 3.2 The Participants | 第29-30页 |
| 3.3 Instrument | 第30-31页 |
| 3.4 Indexes for Language Complexity in this Study | 第31-32页 |
| 3.5 Data Collection and Analysis | 第32-34页 |
| Chapter 4 Results and Discussion | 第34-51页 |
| 4.1 Syntactic Complexity Features of Different Grades | 第34-39页 |
| 4.2 Lexical Complexity Features in Different Grades | 第39-44页 |
| 4.2.1 Lexical Variation in Different Grades | 第39-41页 |
| 4.2.2 Lexical Sophistication in Different Grades | 第41-44页 |
| 4.3 The Relationship between Syntactic Complexity and Writing Proficiency | 第44-46页 |
| 4.4 Correlation between Lexical Complexity and Writing Proficiency | 第46-49页 |
| 4.4.1 Lexical variation in Different Level Groups | 第46-47页 |
| 4.4.2 Lexical Sophistication in Different Level Groups | 第47-49页 |
| 4.5 Summary | 第49-51页 |
| Chapter 5 Conclusion and Implications | 第51-54页 |
| 5.1 Major Findings in the Study | 第51页 |
| 5.2 Implication of the Study | 第51-53页 |
| 5.3 Limitations and Suggestions for Further Study | 第53-54页 |
| Bibogrophy | 第54-59页 |
| Appendix Ⅰ | 第59-61页 |
| Appendix Ⅱ | 第61-62页 |
| Appendix Ⅲ | 第62-64页 |
| Appendix Ⅳ | 第64-65页 |
| Acknowledgement | 第65-66页 |
| 在读期间公开发表论文（著）及科研情况 | 第66页 |
