According to legend, the official script was compiled by Cheng Miao in prison at the end of Qin Dynasty. It has been simplified, with the simplification removed, the font changed into a circle and a square, the stroke changed into a straight, and the "Lian Bi" changed into a "broken pen", which makes it easier to write from lines to strokes. "Li Ben" is not a prisoner, but a small official, that is, a small official in charge of documents, so in ancient times, official script was called "Zuo Shu".