Lishu is a Chinese font, including Qin Li and Han Li. Generally speaking, it is developed from seal script, with wide and flat fonts, long horizontal paintings and short vertical paintings, and pays attention to "swallow tail of silkworm head" and "twists and turns". According to the unearthed bamboo slips, Lishu was established in the Qin Dynasty.
Official script generally uses the brush with wolf hair or double brush, seal script, official script and regular script are all suitable for wolf hair or double brush, running script or cursive script is suitable for Yang Hao or double brush, and the specific font of calligraphy should be determined according to specific needs and personal habits. Before the Qing Dynasty, all calligraphy was written with hard pen. Yang Hao's brush only appeared in the middle of the Qing Dynasty, and the pen-making technology was also developing.