Because the content and nature of the paper itself are different, the research fields, objects, methods and expressions are different, and the classification methods of the paper are also different. According to the different contents and research methods, the paper can be divided into theoretical papers, experimental papers, descriptive papers and design papers. In addition, there is a comprehensive classification, which divides papers into four categories: thematic category, argumentative category, comprehensive category and comprehensive category. Thematic, on the basis of analyzing the previous research results, express opinions in the form of direct discussion, and put forward academic problems of a certain subject from the front. It is an argumentative paper, aiming at others' views on an academic problem of a certain subject, relying on sufficient arguments, focusing on exposing its shortcomings or mistakes, and expressing opinions through the form of argumentative paper.