After writing a paper, the author will read the full text and come up with information or words that can express the main content of the paper. These residences or words can be found and selected from the title of the paper and the content of the paper. For example, in the last example, six keywords were selected, of which the first three were selected from the topic of the paper and the last three were selected from the content of the paper. The selection of the last three keywords supplements the main content information that the title of the paper fails to express, and also improves the conceptual depth involved. Need to choose, together with the keywords selected from the title, to form the keyword group of this article.

The use of keywords and subject words is mainly to meet the needs of computer retrieval and international computer online retrieval. Adding keywords to publications opens up a new way for publications to improve their citation rate and increase their popularity.

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