Literature review is also called literature review. Summarization and evaluation of related literature on a certain topic. The summary requires a comprehensive and objective exposition of the research status and existing problems of this topic. Evaluation is based on the evaluation, indicating the reviewers' views on this situation and problems. As a teaching link in universities, it aims to cultivate students' ability to consult and sort out materials. It is one of the basic means to cultivate students' ability to engage in scientific research independently in higher education, especially in senior undergraduate and postgraduate education. It must be used in both the course teaching stage and the thesis writing stage. The following is the format of literature review for your reference. * * * Qi Xin works together. I also want to write my graduation thesis. 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: