At present, there are four main databases that provide paper detection services in the system: ① cnki paper detection system of China Knowledge Network; ② Similarity detection system for Wanfang papers; 3 paper raters; ④ VIP access detection system. At present, China HowNet and Wanfang detection systems are widely used, but they are not free. China HowNet detection system is the most authoritative detection system, and only universities and some institutions have the right to use it. However, the detection effect of PassPaper and CNKI is similar, so everyone generally uses PassPaper for self-detection and then makes modifications according to the test report.

Introduction of Baidu Xiyue Paper Detection.