Literature review is an indispensable part of the paper, usually after the introduction. Its function is to summarize, analyze and evaluate the previous research, so as to better explain its research purpose, research problems, research methods and research significance. Literature review should include the general situation, important findings and conclusions of previous related studies, and also point out the limitations and shortcomings of these studies.

When writing literature review, we need to adopt systematic methods, including collection, screening, sorting, analysis and induction. Relevant literature can be obtained by searching academic journals, library resources and online databases. Then, according to the research objectives and problems, relevant documents are screened out for reading and sorting out. When sorting out, we should classify the documents according to different topics and research directions in order to better analyze and evaluate them.

When writing a literature review, we should pay attention to the following points:

First of all, we should choose the classic and representative literature related to our research topic for review. Secondly, we should analyze and evaluate these documents objectively, comprehensively and systematically, and point out their advantages and disadvantages. Finally, we should point out the limitations and shortcomings of previous research, and put forward our own research ideas and methods in combination with our own research goals and problems.

To sum up, literature review is an indispensable part of the paper, and its function is to summarize, analyze and evaluate the relevant research of predecessors, so as to better explain its research purpose, research problems, research methods and research significance. When writing literature review, we need to adopt systematic methods, including collection, screening, sorting, analysis and induction.