The amount of plagiarism depends on the regulations of specific schools or institutions.

Generally, the duplicate checking rate of undergraduate theses is less than 30%, and most master theses are less than 20%. However, some schools limit the duplicate checking rate of papers to less than 20%; Some schools think that the phenomenon of "citation standard of paper splicing" is plagiarism, while others think that it does not constitute plagiarism, but the format of the paper is not standardized and there are quality problems in the paper. General universities stipulate that the duplicate checking rate of undergraduate thesis is less than 30%, and if it exceeds 30%, it will be judged as plagiarism, and it needs to be revised and re-tested until it meets the requirements, otherwise it will lead to failure to graduate normally. Doctoral thesis stipulates that the standard of duplicate checking rate is stricter, and the duplicate checking rate should be controlled between 5%- 10%.

Therefore, when writing a thesis, students need to understand and abide by the duplicate checking rate of their own school or institution.