Literature review is a method to comprehensively sort out, analyze and synthesize the relevant literature in a certain field or discipline, which usually includes the following steps:

Determine the research topic and purpose: make clear the fields, problems and research purpose of literature review, so as to collect and screen the literature in a targeted manner.

Document collection: Collect documents related to research topics, including periodical papers, dissertations, conference papers, monographs, reports, etc. Through libraries, databases and the Internet.

Screening documents: according to the research theme and purpose, the collected documents are preliminarily screened, and the documents irrelevant to the research or not meeting the research requirements are eliminated.

Reading literature: read and understand the selected literature carefully, and extract and sort out the core information and research results in the literature.

Collating documents: Collating documents according to different classification standards such as time, theme, research methods and sample characteristics.

Writing a literature review: based on the comprehensive analysis of the existing literature, writing a literature review, summarizing the research fields or problems, and pointing out the shortcomings of the existing research and the future research direction.

Revision and improvement: according to the feedback and suggestions of tutors or experts, the literature review is revised and improved in time to improve the quality and credibility of the review.

It should be noted that literature review needs to make full use of all kinds of literature resources and make comprehensive, systematic and objective analysis and synthesis to ensure a thorough and accurate understanding and grasp of research fields or problems. At the same time, we should also pay attention to the source and quality of documents to avoid being influenced by unreliable or biased documents.