Different majors have different requirements, and the general full-text repetition rate is below 30%. There should be no requirement for the repetition rate of each chapter. Every school will make detailed rules, and schools will also give them places to check the repetition rate, which are basically China HowNet.

The specific concepts of duplicate checking rate are plagiarism rate and citation rate. Test the similarity between your article and others' papers with professional software to prevent plagiarism.