Papers include academic year papers, graduation papers, dissertations and scientific papers. The graduation thesis written by colleges and universities is only one kind of thesis. According to the content and nature of the paper itself, there are different classification methods for the types of papers. According to the different contents and research methods, the paper is divided into theoretical papers, experimental papers, descriptive papers and design papers. Comprehensive classification, that is, the thesis is divided into four categories: thematic, argumentative, comprehensive and comprehensive.