There are two kinds of seal script: big seal script and small seal script: small seal script is the result of unified writing during Qin Shihuang's period. Therefore, it became the earliest standardized writing in China: simplified on the basis of the Qin Dynasty, and created a unified writing form of Chinese characters. It has been popular from the Qin Dynasty to the Western Han Dynasty, and it is deeply loved by calligraphers because of its beautiful font and long ancient rhyme. Official script is a kind of writing developed from Xiao Zhuan. Originated in the Warring States Period and stereotyped in the Han Dynasty, it became the official certified standard font in the Eastern Han Dynasty, especially popular in the Eastern Han Dynasty, which made the official script perfect. The overall structure of Lishu is horizontal and vertical. Compared with Lishu, the strokes are simplified a lot, and the circle becomes a square fold. Regular script is gradually evolved from official script. Compared with other fonts, regular script fonts are square and square, and the middle is reduced to a moment. "The shape is square, the strokes are tall and straight, and the French style is respected, which can be used as a model." Regular script was founded in the late Eastern Han Dynasty, so it was thought that it was founded in the Wei and Jin Dynasties of the Three Kingdoms and gradually matured in the Tang Dynasty. Running script is between regular script and cursive script, and it is written randomly when regular script is written more than cursive script. It is a running script, and vice versa. Running script was founded by Liu Desheng at the end of the Eastern Han Dynasty, and prevailed in the Eastern Jin Dynasty.