Literature review is the result of information research, which is based on reading, selecting, comparing, classifying, analyzing and synthesizing the literature, and the researcher comprehensively describes the research status of a certain problem in his own language. The collection, arrangement and analysis of literature laid the foundation for the writing of literature review. The format of literature review generally includes: introduction of literature review: including the reason, significance, scope, text title and basic content overview of literature; Literature review body: It is the main content of literature review, including history (seeking the development process of research problems), present situation, basic content (seeking the progress of understanding), research method analysis (seeking the reference of research methods), solved problems and remaining problems, and paying attention to the current influence and development trend in detail, which not only enables researchers to determine the research direction, but also facilitates others to understand the starting point and breakthrough point of this study. The conclusion of literature review: the conclusion of literature research, summarizing my own research viewpoints, existing different opinions and problems to be solved, etc. Appendix to literature review: list the references and explain the materials on which the literature review is based, so as to increase the credibility of the review and facilitate readers' further retrieval.

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