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Thesis is a Chinese word, and its pinyin is lùn wén, which is a common word in classical literature and refers to conversation or exchange of ideas. Nowadays, papers are often used to refer to articles that conduct research in various academic fields and describe academic research results, which are referred to as papers for short. It is not only a means to discuss problems in academic research, but also a tool to describe academic research results in academic exchanges. Including academic papers, graduation papers, dissertations, scientific papers, achievement papers and so on.

With the rapid development of computer technology and Internet, online query, retrieval and download of professional data has become an important means of scientific and technological information retrieval. For all kinds of full-text databases or abstract databases on the Internet, abstract index is an important tool for readers to retrieve documents, which provides convenience for the construction and maintenance of scientific and technological information literature retrieval databases. It is a comprehensive introduction to the paper, so that people can understand the main contents of the paper.

After the paper is published, the abstract can be directly used by abstract magazines or various databases without modification or slight modification, so that readers can know the main contents of the paper as soon as possible to supplement the deficiency of the title, thus avoiding misunderstandings, deficiencies and even mistakes that may occur when others compile the abstract. Therefore, the quality of abstracts directly affects the retrieval rate and citation frequency of papers. Copyright of papers should be registered voluntarily. Whether these files are registered or not,

Copyright obtained by authors or other copyright owners according to law shall not be affected. The voluntary registration system of works in China aims to safeguard the legitimate rights and interests of authors or other copyright owners and users of works, help solve copyright disputes caused by copyright ownership, and provide preliminary evidence for solving copyright disputes. In order to explore and master the writing rules and characteristics of papers, it is necessary to classify papers.

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. Papers can be divided into theoretical papers, experimental papers, descriptive papers and design papers according to the nature of content and research methods.