| Abstract in Chinese | 第8-9页 |
| Abstract in English | 第9-10页 |
| 1 Introduction | 第11-15页 |
| 1.1 Overview: Research Background | 第11-12页 |
| 1.2 Statement of the Problem | 第12-13页 |
| 1.3 Significance of the Study | 第13-14页 |
| 1.4 Framework of Thesis | 第14-15页 |
| 2 Literature Review | 第15-24页 |
| 2.1 The Sociocultural Theory and Its Key Theory - the Mediation Theory | 第15-18页 |
| 2.1.1 Introduction of the Sociocultural Theory | 第15-16页 |
| 2.1.2 Introduction of the Mediation Theory | 第16-17页 |
| 2.1.3 The Application of the Mediation Theory in the Second Language Acquisition | 第17-18页 |
| 2.2 Previous Studies on Business English Writing Teaching | 第18-22页 |
| 2.2.1 Studies on Business English Writing as a Process | 第18-20页 |
| 2.2.2 Studies on the Teaching Methods of Business English Writing Abroad | 第20-21页 |
| 2.2.3 Studies on the Teaching Methods of Business English Writing in China | 第21-22页 |
| 2.3 Paradigm Shift in Business English Writing | 第22-24页 |
| 3 Research Methodology | 第24-32页 |
| 3.1 Research Question | 第24页 |
| 3.2 Research Participants | 第24-25页 |
| 3.3 Research Instruments | 第25-27页 |
| 3.3.1 Interview | 第25-26页 |
| 3.3.2 Writing Tests | 第26页 |
| 3.3.3 Process log | 第26-27页 |
| 3.3.4 Stimulated Recall | 第27页 |
| 3.4 Research Procedure | 第27-32页 |
| 3.4.1 Investigation Before the Mediated Method Application in Elective Course | 第27-28页 |
| 3.4.2 The Design of Mediated Method Application in Elective Course | 第28-30页 |
| 3.4.3 Evaluation After the Mediated Method Application in Elective Course | 第30-32页 |
| 4 Data Analysis and Discussion | 第32-47页 |
| 4.1 Quantitative Analysis | 第32-39页 |
| 4.1.1 The Proficiency of Participants’ Business English Writing Before the Mediated MethodApplication in Elective Course | 第32-35页 |
| 4.1.2 The Proficiency of Participants’ Business English Writing After the Mediated MethodApplication in Elective Course | 第35-39页 |
| 4.1.3 Summary of Quantitative Analysis | 第39页 |
| 4.2 Qualitative Analysis | 第39-47页 |
| 4.2.1 Analysis of the Interview | 第39-40页 |
| 4.2.2 Analysis of the Process Log | 第40-43页 |
| 4.2.3 Analysis of the Stimulated Recall | 第43-45页 |
| 4.2.4 Summary of Qualitative Analysis | 第45-47页 |
| 5 Conclusion | 第47-50页 |
| 5.1 Summary of the Study | 第47-48页 |
| 5.2 Pedagogical Implications | 第48-49页 |
| 5.3 Limitations and Suggestions for Future Research | 第49-50页 |
| Acknowledgement | 第50-51页 |
| References | 第51-54页 |
| Appendix A Interview Questions | 第54-55页 |
| Appendix B Pre-test | 第55-56页 |
| Appendix C Post-test | 第56-57页 |
| Appendix D Specific-test | 第57-58页 |
| Appendix E Writing Evaluation Criteria of BEC Vantage Level | 第58-60页 |
| Appendix F Process Log | 第60-61页 |
| Papers Published in the Period of Ph. M. education | 第61页 |
