Subtitles are aimed at the main topic, which is a supplementary explanation to the main idea of the full text. Subtitles dominate some content in the text. Subtitle is an important part of an article, which is related to the spirit and style of an article. A good title can give people a fresh feeling and a deep impression. Subtitles, main headlines and quotations constitute the title of an article (news). For example, in the trial version of a book, the main title is the title, the subtitle is (trial version), and the table of contents is the subtitle. Subtitle is a supplementary explanation to the topic and the full text of the paper, which is usually written on the line below the topic, but subtitle is not necessary for the paper and can only be used in certain circumstances. The function of the subtitle of the thesis title: the scope of the proposed main title is too large and is limited by the subtitle. The main title is endless, and the subtitle plays a complementary role, and the two complement each other. Usage of paper subtitle: the meaning of subtitle is incomplete, and subtitle is used to supplement the specific content of the report paper; Reports and papers are published in volumes, or a series of work is divided into several reports, or research results are published in stages, and their specific contents are distinguished by different subheadings; Others need subheadings as extensions or explanations.