| Acknowledgements | 第5-6页 |
| Abstract | 第6页 |
| Chapter One Introduction | 第8-12页 |
| 1．1 Background | 第8-9页 |
| 1．2 Definition of 'Language-switching' | 第9-10页 |
| 1．3 Organization of the Thesis | 第10-12页 |
| Chapter Two Theories of Bilingual Memory and L-S in L2 Composing Process | 第12-22页 |
| 2．1 A General Introduction | 第12-13页 |
| 2．2 Early Theoretical Formulation | 第13-16页 |
| 2．3 Current Theoretical Models of Bilingual Memory Representation | 第16-20页 |
| 2．3．1 Hierarchical Models | 第16-18页 |
| 2．3．2 The Revised Hierarchical Model | 第18-20页 |
| 2．4 Implications of the Bilingual Memory Theories | 第20-22页 |
| Chapter Three Writing Process Theories and Previous Studies on L-S in L2 Composing Process | 第22-41页 |
| 3．1 Historical Sketch of Approaches to L2 Composition | 第22-24页 |
| 3．2 The Process Theory of L1 Writing | 第24-30页 |
| 3．2．1 The Expressive Stage | 第24页 |
| 3．2．2 The Cognitive Approach | 第24-30页 |
| 3．2．2．1 Flower and Hayes' Model | 第24-27页 |
| 3．2．2．2 White and Arndt's Model | 第27-28页 |
| 3．2．2．3 Bereiter and Scardamalia's Model | 第28-30页 |
| 3．2．3 The Social Stage | 第30页 |
| 3．3 L2 Composing Process Models | 第30-33页 |
| 3．3．1 Wang & Wen's L2 Composing Process Model | 第31-33页 |
| 3．4 Previous Studies on L-S in L2 Composing Process | 第33-41页 |
| 3．4．1 The Role of L-S in L2 Composing Process | 第34-36页 |
| 3．4．2 The Amount of L-S in L2 Composing Process | 第36-37页 |
| 3．4．3 The Factors Affecting L-S in L2 Composing Process | 第37-39页 |
| 3．4．4 The Effects of L-S on L2 Text Quality | 第39-41页 |
| Chapter Four Research Methodology of the Present Study | 第41-48页 |
| 4．1 Qualitative and Quantitative Research | 第41-43页 |
| 4．2 The Research Methods Employed in the Present Study | 第43-48页 |
| 4．2．1 Introspective Methods | 第43-46页 |
| 4．2．1．1 Think-aloud and Retrospective Interview | 第44-46页 |
| 4．2．2 Elicitation Techniques | 第46-48页 |
| 4．2．2．1 Questionnaire Surveys | 第46-48页 |
| Chapter Five The Present Study | 第48-86页 |
| 5．1 Research Design | 第48-57页 |
| 5．1．1 Research Questions | 第48页 |
| 5．1．2 Pilot Studies | 第48-52页 |
| 5．1．2．1 Pilot Study 1 | 第48-50页 |
| 5．1．2．2 Pilot Study 2 | 第50-52页 |
| 5．1．3 Participants | 第52-53页 |
| 5．1．4 Data Collection | 第53-56页 |
| 5．1．4．1 Stage 1 Think-aloud | 第53-56页 |
| 5．1．4．2 Stage 2 Questionnaire Survey | 第56页 |
| 5．1．5 L-S Data Analysis | 第56-57页 |
| 5．2 Results | 第57-72页 |
| 5．2．1． Research Question 1 | 第57-61页 |
| 5．2．2． Research Question 2 | 第61-68页 |
| 5．2．3． Research Question 3 | 第68-72页 |
| 5．3 Discussion and Conclusion | 第72-84页 |
| 5．3．1 L-S in the L2 Composing Process | 第72-76页 |
| 5．3．2 Contributing Factors to L-S in the L2 Composing Process | 第76-80页 |
| 5．3．3 Effects of L-S on L2 Text Quality | 第80-81页 |
| 5．3．4 A Dynamic Modal of L2 Writing Process Centering on L-S Behavior | 第81-84页 |
| 5．4 Limitations and Suggestions for Future Research | 第84-86页 |
| References | 第86-92页 |
| Appendix 1 Think-aloud Training 1 | 第92-93页 |
| Appendix 2 Think-aloud Training 2 | 第93-94页 |
| Appendix 3 Retrospective Interview Questions | 第94-95页 |
| Appendix 4 L2 Test Quality Scale | 第95-96页 |
| Appendix 5 Questionnaire | 第96-101页 |
| Appendix 6 An Example of Think-aloud Protocols | 第101页 |
