Different detection systems have different databases and algorithms, so the detection results are different. Therefore, the school will designate a duplicate checking system, and it is suggested that the final version should be based on the report of the testing system required by the school. If it is the first draft, you can use the paper series to check it first, such as paperfree, which perfectly realizes the whole process of "free paper detection-online real-time marking-comprehensive paper detection-successful paper detection" for users. It is not only cost-effective, but also suitable for real-time duplicate checking after modification.