The joint comparison database of college students refers to the professional comparison database of college students' papers. This database mainly includes the papers of four seniors and sisters, referred to as pmlc. At the same time, pmlc is also produced by tmlc2, a joint comparison database for master's and doctoral dissertations. The papers in this database are constantly updated and increased.

Generally, the HowNet pmlc, which contains the joint comparison database of college students' papers, is the most accurate and authoritative for undergraduate and junior college graduation thesis, because the HowNet pmlc is the standard for undergraduate graduation thesis. Postgraduate graduation thesis generally adopts the HowNet VIP detection system with a joint comparison database of academic papers, because graduate schools generally use HowNet VIP, and core journals and magazines generally have strict requirements, so it is necessary to compare academic papers with the joint comparison database.