2. Official script refers not only to regular script, but also to Weibei. Cursive script refers to the wild grass represented by Zhang Xu and Huai Su, and also refers to the big grass; It also refers to a cursive script that is more standardized than wild grass, which is called "Book Score" by Sun in the Tang Dynasty. In addition, there is an urgent official script called Cao Zhang. Between grass and grass is a running script. Lishu came into being in the late Qin Dynasty and early Han Dynasty. At first, it was mainly used to copy official documents in order to be concise, and later it was also used to write inscriptions and cliff carvings. Seal script is the general name of Oracle Bone Inscriptions, Zhong Ding, Shigu and Xiao Zhuan. Oracle Bone Inscriptions, with a history of 3,000 years, is the earliest recognizable script handed down from ancient times, mainly used for divination. The brushwork is thin and powerful, with many straight lines. There are Fang Bi, round pen and sharp pen, and there are many "hanging needles" for writing.