If the user has successfully uploaded the paper to the duplicate checking system of HowNet and started the test, it is impossible to ask for suspension or provide modification service if the content is wrong during the test, and the duplicate checking process of HowNet is irreversible. Therefore, before uploading the paper to the duplicate checking system, the user should check whether there are any problems with his paper. If the duplicate check has been started, you need to wait until the duplicate check is completed before modifying the paper, but it will also affect the repetition rate of the paper.