Paper duplication checking usually covers the relevant literature in the past few years to ensure the originality and independence of the research results. Specifically, different schools or institutions may have different requirements for paper duplicate checking, but under normal circumstances, undergraduate graduation thesis will be kept for 5-6 years and junior college graduation thesis will be kept for 2-3 years.

Different schools or institutions may have different requirements for paper duplicate checking, so when choosing duplicate checking system, we should test it according to the specific requirements of schools or institutions. In recent two years, the common duplicate checking systems are HowNet, VIP, papertime, paperfree and so on. It is suggested that you choose an appropriate duplicate checking system for paper detection to ensure that the paper conforms to academic norms.