The repetition rate of papers is mainly based on the requirements of schools. General undergraduate thesis 20-30%. You can ask your school for details and find out what kind of duplicate checking system your school uses. When checking duplicates, it is best to use the same duplicate checking system. If other duplicate checking systems are used, it is suggested to change the repetition rate to a lower level before submitting it to the school. For example, the school requires 30%, and it is best to use 20% in the duplicate checking system such as PaperPP, which will be more stable.