If the summary of the doctoral thesis is included in the duplicate checking system, it will be included in the repetition rate. The duplicate checking system will detect the repetition rate of the paper, and if there is any published content in the paper, the repetition rate will be counted. Therefore, when writing a doctoral thesis, we should try to avoid copying published papers to avoid high repetition rate. At the same time, if the content of the review cannot be avoided being detected by the duplicate checking system, we can try to reduce the repetition rate of the paper by modifying the expression of the paper and discussing it in sections.