Second, fonts tend to be simple and writing tends to be fast. Li Shu gradually evolved into a cursive script in the Han Dynasty. Cursive script is a new calligraphy style in Han Dynasty, which is divided into Cao Zhang and Cao Cao. The Han Dynasty belongs to the early stage of Cao Zhang, and the Eastern Jin Dynasty belongs to the mature stage of Cao Cao. The county system and civil service system implemented in Qin and Han dynasties made the application of characters occupy an increasingly important position in people's lives, and the requirements for application and writing speed are increasing day by day. Cursive script was originally created to meet the needs of rapid writing, but it soon entered the field of pure creation and appreciation as an art form, laying the foundation for the rise of literati calligraphy with different personalities in Wei, Jin, Southern and Northern Dynasties. The cursive script of the Western Han Dynasty is still a simple and quick script of ancient Li, which is called the stage of or. In the Eastern Han Dynasty, cursive script gradually appeared as shorthand for mature official script, and was called Cao Zhang.