The official script is slightly broad and flat, with long horizontal strokes and short straight strokes. It is in a rectangular shape and pays attention to "silkworm head and swallow tail" and "twists and turns". Official script originated in the Qin Dynasty and was compiled by Cheng Miao. It reached its peak in the Eastern Han Dynasty and had a considerable influence on later calligraphy. In the calligraphy circle, it is known as "Han Li Tang Kai".