The first layer includes the origin, purpose, significance, main methods and scope of the topic, including literature review in a certain research field.

The second layer is the present situation of this research field at home and abroad, the achievements made by predecessors, the knowledge gaps and problems left behind, and the problems that have not been solved or need to be solved urgently, thus leading to my own research motivation and significance.

The third layer studies the problems to be solved, thus putting forward its own new arguments and pointing out the advanced, scientific, theoretical significance and application value of this research work.

The general description of the fourth layer of research content. The analysis method of dissertation generally follows two procedures, one is logical analysis procedure: analysis and synthesis, and the other is systematic synthesis procedure: synthesis, analysis and synthesis. I think it is best to adopt a systematic and comprehensive procedure, which has the function of establishing a strategic plan and outlining an outline.

The first synthesis of the comprehensive procedure is the preface, which regards the research object as a synthesis and gives a general description of one's own views. On the basis of synthesis, analysis is to discuss each part from different angles by chapter, and the results of each analysis are fed back to the synthesis at the next higher level. The following synthesis is in the conclusion part of the paper, summarizing the research of the whole paper and summarizing my own viewpoints.