Collect a large number of related materials of topics, problems or research topics in a certain field, a certain specialty or a certain aspect, and then sort out the latest progress, academic viewpoints or suggestions of current topics, problems or research topics through reading, analyzing, summarizing and sorting out.

Literature review refers to the review of the research status in this research field on the basis of extensive reading and understanding of the literature in this research field after the topic is determined.

It is a style different from graduation thesis to comprehensively analyze, summarize and comment on new level, new trend, new technology, new discovery and development prospect, and put forward your own opinions and research ideas.

It requires the author not only to comprehensively sort out and state the main points of the materials he has consulted, but also to make a more professional, comprehensive, in-depth and systematic discussion and corresponding evaluation of the comprehensively sorted documents according to his own understanding and understanding, rather than just "piling up" academic research in related fields.

In the introduction (or introduction, introduction) part of the abstract, the following contents should be clearly written:

1 First, explain the purpose of writing, and make clear the theme, problems and research areas of review.

2. Point out the general trend of published literature on the theme of review, and explain the definitions of related concepts.

3, the provisions of the scope of review, including the subject scope and time range, need to declare the starting and ending years of the cited documents, to explain, analyze and compare the documents and organize the review order.

4. Briefly explain the current situation of relevant issues or the focus of debate, and lead to the core theme of written summary, which is the most concerned and interested by readers and the main line of writing summary.