| Acknowledgements | 第1-6页 |
| Abstract in Chinese | 第6-7页 |
| Abstract in English | 第7-11页 |
| Chapter I Introduction | 第11-17页 |
| ·Background of the Research | 第11页 |
| ·Terminologies | 第11-14页 |
| ·Code and Codeswitching | 第11-13页 |
| ·Codeswitching, Code-mixing and Borrowing | 第13-14页 |
| ·Significance of the Present Study | 第14-15页 |
| ·Organization of the Thesis | 第15-17页 |
| Chapter II Literature Review | 第17-25页 |
| ·Codeswitching Studies Abroad | 第17-19页 |
| ·Codeswitching Studies in China | 第19-20页 |
| ·Teacher’s Codeswitching in Classroom | 第20-21页 |
| ·Codeswitching and Theory of Adaptation | 第21-25页 |
| ·Adaptation Theory | 第21-23页 |
| ·Codeswitching as Realization of Adaptation | 第23-25页 |
| Chapter III Research Methodology | 第25-28页 |
| ·Sampling Procedure | 第25页 |
| ·Data Collection Methodology | 第25-26页 |
| ·Classroom Observations | 第25页 |
| ·Teacher Interviews | 第25-26页 |
| ·Student Questionnaires | 第26页 |
| ·Data Analysis | 第26-27页 |
| ·Validity | 第27-28页 |
| Chapter IV Findings of the Investigation | 第28-36页 |
| ·Results of the Observation | 第28-32页 |
| ·Distribution of Chinese/English Discourse in Postgraduate Classroom | 第28-29页 |
| ·Results of Student Questionnaires | 第29-32页 |
| ·Results of Teachers’Interview | 第32-33页 |
| ·Psychological Motivation and the Adaptive Model | 第33-36页 |
| Chapter V Discussion of the Strategies | 第36-47页 |
| ·Realization of the Adaptive Model for Codeswitching | 第36-47页 |
| ·Codeswitching as Giving Examples Strategy | 第36-37页 |
| ·Codeswitching as Making Explanations Strategy | 第37-39页 |
| ·Codeswitching as Providing Thinking Strategy | 第39-40页 |
| ·Codeswitching as Enlivening Atmosphere Strategy | 第40-41页 |
| ·Codeswitching as Giving Emphasis Strategy | 第41-42页 |
| ·Codeswitching as Making Economy Strategy | 第42-43页 |
| ·Codeswitching as Facilitating Understanding Strategy | 第43-45页 |
| ·Codeswitching as Making Generalization Strategy | 第45-47页 |
| Chapter VI Conclusion | 第47-50页 |
| ·Summary of Major Findings | 第47页 |
| ·Implication of the Study | 第47-48页 |
| ·Limitations and Further Studies | 第48-50页 |
| Appendix（Student Questionnaire） | 第50-53页 |
| Bibliography | 第53-55页 |
