There are four types of printed fonts: Song font, Song font, Kai font, and Hei font. These four glyphs are introduced below. Song style, also known as Lao Song style, is a popular Chinese character printing style. The character shape is square, the strokes are rigorous, the horizontal strokes are thin, the vertical strokes are thick, and there are decorative dots and lines. This font is generally used for the main text of books and newspapers. The imitation Song style is made up of the structure of the Song style and the brushwork of the regular script. Its strokes have the same thickness, uniform structure, and elegant fonts, with three styles: long, square, and flat. It is mostly used for printing the text of documents or poems, quotations of articles, prefaces of books, illustrations of plates, etc. Regular script is also called living body. The shape is similar to handwritten regular script, with dignified characters and round strokes. It is mostly used for printing popular books, primary and secondary school textbooks and children's books. Black body is also called bold body and square body. The strokes are thick and thick, the fonts are full, and the writing is eye-catching. It is mostly used in titles, slogans, advertisements or highlighted parts of articles.