Keywords are the most critical group of keywords extracted from papers for document indexing, and they are a group of information language words used to describe the theme of documents and provide convenience for document retrieval. Generally, after the Chinese and English abstracts, the dissertation lists 3-5 Chinese and English keywords respectively.

First of all, the key words of the paper should be able to summarize the key points of the paper, and the author can make some generalizations according to the research content, so that readers can understand the content and direction of the paper research according to the key words. The article keyword extraction should be selected according to the key degree, and it is best not to be too concentrated. There are many keywords in a paper, because the number of words in the paper is large, the amount of information is also large, and there are many related contents. Therefore, it is not easy to choose keywords. You can sort roughly according to the degree of key, and choose the most key words. At the same time, the key must not be repeated in an article, otherwise choosing a suitable degree will be biased, and it is best to distribute it throughout the article.

Secondly, the key words should not be too broad. For example, if you have an important discovery in the field of astronomy, then your keywords should not be too broad keywords such as "astronomy" and "universe". Because these keywords can't help researchers find the relevant literature in a specific sub-field. It is suggested to select keywords around the core concepts mentioned in the abstract.

Then, if the paper involves a certain professional technology or method, it is necessary to display professional terms in the title or keywords, which can effectively improve the accuracy of researchers' search for papers and the citation rate of papers.

Finally, when writing keywords, we should pay attention to whether the keywords have other meaning to avoid ambiguity and inconsistency.