The research methods of this paper are: normative research, empirical research, case analysis, comparative analysis, thinking method, content analysis, literature analysis and mathematical method. Research method refers to the tools and means to discover new phenomena and new things in research, or to put forward new theories and new viewpoints and reveal the internal laws of things.

Papers are often used to refer to articles that carry out research in various academic fields and describe academic research results. It is not only a means to discuss problems in academic research, but also a tool to describe academic research results in academic exchanges. So what are the research methods of this paper?

Research methods of the thesis

The research method of this paper is investigation, that is, collecting relevant research objects purposefully and systematically; Observation method refers to directly observing the research object with one's own senses and auxiliary tools; Causal analysis refers to the dialectical thinking method of analyzing the causal relationship between phenomena and understanding the cause and result of problems. There are also experimental methods, induction and deduction methods, empirical research methods, quantitative analysis methods and so on.

Literature research is a method to obtain information by collecting, identifying and sorting out documents according to a certain purpose or theme, so as to fully and correctly understand the problems to be studied. It is an indirect and non-invasive survey, which is widely used in various disciplines.

Advantages: convenience, freedom, less external constraints, as long as you find the literature, you can conduct research anytime and anywhere; It is time-saving, money-saving and efficient to acquire knowledge on the basis of predecessors' learning.

Three steps of operation:

1.？ Determine the content of the theme

Firstly, the research topic is determined through a certain investigation, and then the books that need to be referenced in literature research are roughly listed. In this way, the general direction of retrieval can be determined, and relevant documents can be searched according to the general direction.

2.？ Search, screen and sort out the literature.

Give priority to the collection of documents published in recent five years, which have strong professional relevance and are published in famous journals, so as to ensure the timeliness, professionalism and authority of the documents. After the search is over, we need to sort out and record it, and suggest that students set up special folders to integrate and summarize different types of documents.

3. Write a literature review.

Literature review is a personal view based on the cognition of the research field and the comprehensive understanding of the literature by researchers. The components are: the development background and present situation of the research field, the previous research in this field, and the unique findings of researchers in this field. Students who have questions about this part can go to see the writing method of literature review sent by Lao Wang before. )

Ways and methods of literature retrieval;

Literature can be divided into paper version and electronic version.

Paper documents can be collected in libraries and archives.

The main channels of electronic documents are as follows:

① Comprehensive search websites: Google Academic and Microsoft Academic.

② Chinese databases: China HowNet, Wanfang and VIP.

③ Foreign language database: knowledge network, scientific guidance, engineering village, Elsevier.