The contents of ppt preparation before the defense include: the background and significance of the research topic, the current situation and development of the topic, the research ideas and process, the experimental data results, solutions and summary.

1. First of all, the PPT cover of graduation thesis defense should include: graduation thesis title, respondent, instructor and defense date.

2. Secondly, there needs to be a table of contents page, which clearly explains the main contents of the research.

3. Next, the research background and significance of the subject are introduced.

4. After that, the theoretical basis of the research content is introduced. This part is simple and clear.

5. The highlight is naturally your own research content. In this part, it is best for teachers who don't know much about the relevant aspects to listen and know what work has been done, what research results are there, and what research results are there.

6. Finally, the summary and prospect of the work.

7. Finally, thank the teachers for their guidance and support.