Mainly according to the duplicate checking rate. In other words, if the plagiarized content accounts for more than 30% of the whole paper, it is judged as plagiarism, that is, the paper is judged as unqualified.

General colleges and universities require that the repetition rate must be lower than 30%, and more than 30% is unqualified.

When the paper duplicate checking system of HowNet is tested, the basic standard is that there are more than 8 words in a sentence or 13 consecutive characters in a natural paragraph, which is judged as duplication.