Keyword selection method: after the author finishes writing the paper, he selects from its title, hierarchical title and text (high-frequency words and keywords).

Matters needing attention in the selection of paper keywords:

1. The key words of academic papers must be words or terms.

"Word" refers to a word that can contain a morpheme (the smallest meaningful unit in a language) or the smallest free-use unit in a language, while "term" refers to a professional term in a certain discipline.

2, keywords must accurately reflect the theme.

Keywords are words or phrases that reflect the theme of the paper. Generally speaking, they should be arranged at the bottom of the abstract, and the font size is different from that of the text. Generally, 3~8 keywords can be selected, and multiple keywords are separated by semicolons, which are arranged from large to small according to the expansion (conceptual scope) level of the entry.

The main function of keywords is to express the theme of literature discussion or expression clearly and intuitively, so that readers can know the theme of the paper at a glance before reading the abstract and text of academic papers, so as to judge whether to spend time reading the text.

3. Key words should be selected from the National Standard Chinese Glossary as far as possible. Important terms and names such as regions, people and documents in new disciplines and technologies that are not included in the glossary can also be marked as keywords.