1. Database scope: duplicate checking software will access large academic literature databases, such as CNKI and Wanfang, to compare papers. These databases contain a large number of academic documents, professional papers, conference papers, newspapers, books, patents and so on. , which is one of the important sources of paper duplicate checking.
2. Network scope: The duplicate checking software compares the paper with other literature resources and website contents on the Internet by connecting to the Internet.
3. Paper content: Check the text, abstract, theme, introduction, conclusion and other contents of the paper.