First of all, repeated inspection is an important part of the evaluation process. When considering whether an article meets the publishing requirements, the journal editor will check the paper again. If a large number of repetitions, plagiarism or violations of academic norms are found, the paper may be rejected. One of the reasons may be that the author's citation of existing documents is not accurate enough, and he uses too much copying and rewriting of the original text in his thesis, but lacks his own independent thinking and innovative views. In addition, some authors may be too lazy to find and sort out detailed documents because of time constraints or other reasons, resulting in insufficient references in the paper, which makes the duplicate checking results abnormal. In addition, the duplicate checking system is only a tool, which can't judge the academic quality and innovation of the paper, so we can't rely entirely on the duplicate checking results as the decision whether to reject the paper.

Secondly, the duplicate checking system is also one of the factors that affect the rejection of papers. At present, there are many duplicate checking systems in the market, but not all of them are completely accurate and reliable. Some systems may misjudge legal references and a large number of technical terms as duplicates, which will lead to high scores in the duplicate checking system, which will be misjudged as plagiarism and then rejected. In addition, some duplicate checking systems have limited databases, which can only detect published documents and cannot cover unpublished research results and academic exchanges. Therefore, there may be undiscovered duplication in some research fields, which makes the paper pass the duplicate checking system, but it is finally rejected by the editor.