The duplicate checking system for final papers is a system used by schools. Generally, the duplicate checking systems such as HowNet, VIP and Wanfang are used. HowNet uses PMLC for undergraduates and VIP5.3 (also called TMLC2) for postgraduates. The first draft system of HowNet, also called decomposition system (AMLC/SMLC), has one less argument library than the final draft system (one less joint comparison library of college students' papers than undergraduate pmlc, and one less VIP5.3 than an argument library and a source code library). These two papers are all undergraduate/doctoral papers over the years, so the first draft system is cheaper than the final draft system, because the detection results between them are different, sometimes very different, depending on the specific papers.

The first draft and final draft systems of HowNet belong to HowNet system, and the detection algorithm is the same. After the repeated contents in the first draft system are modified to be qualified, the final draft system is still qualified with a high probability, but this is impossible. After all, there are still some blanks in the database of the duplicate checking system.