The calculation rules of duplicate checking rate are calculated by the duplicate checking system according to certain algorithms and rules. Specifically, the duplicate checking system will compare the contents of the paper with the documents in the comparison database, and judge whether the paper is suspected of plagiarism or repetition according to the similarity of sentences, paragraphs and chapters at different levels. The duplicate checking rate is usually expressed in percentage or decimal form, which refers to the proportion of repeated parts detected by the system to the total number of words in the paper.

It should be noted that different duplicate checking systems may have different duplicate checking standards and methods, so the duplicate checking results may be different. In addition, we should pay attention to the selection of reliable duplicate checking systems, such as HowNet, paperfree, papertime and so on. In order to avoid the paper being leaked or used maliciously.