First of all, repeated paper duplicate checking may lead to the distortion of duplicate checking results. Because students will inevitably carry out operations such as paragraph reorganization and sentence rewriting in the process of revising their papers, these modifications may cause the duplicate checking system to misjudge the contents similar to the original documents as plagiarism. In addition, the algorithms and databases of different duplicate checking systems will also affect the duplicate checking results, so repeated duplicate checking in different duplicate checking systems is likely to lead to inconsistent results.

Secondly, repeated duplicate checking may have a negative impact on students' psychology. In the process of repeated duplicate checking, students may have anxiety, nervousness and even insomnia. They may have doubts about the quality of their papers, which will affect the subsequent revision and submission. In addition, some students may rely too much on the duplicate checking system because they are too worried about the duplicate checking results, which leads to their lack of confidence in their ability to think and write independently.

Finally, duplicate checking of papers increases the cost of time and energy for students to finish their papers. Every time you check the duplicate, you need to wait for the system to return the results, which wastes students' precious time. Moreover, some duplicate checking systems may need to pay for multiple duplicate checking, which increases the financial burden of students. In addition, repeated duplicate checking may make students pay too much attention to the apparent plagiarism and neglect the in-depth thinking and improvement of the content and structure of the paper.