1) Lishu is also called "official character" and "ancient book". It is a font produced on the basis of seal script to meet the needs of convenient writing. The seal script is simplified, and the uniform circle lines of the seal script are changed into straight strokes, which is convenient for writing. This is a font created in prison, which can be divided into "Qin Li" (also known as "Guli") and "Han Li" (also known as "Lishu"). The appearance of Lishu is a great change in ancient writing and calligraphy.
2) Lishu is a common solemn font in Chinese characters, with a slightly flat writing effect, long horizontal drawing and short straight drawing, and pays attention to "swallow tail of silkworm head" and "twists and turns". It originated in the Qin Dynasty and reached its peak in the Eastern Han Dynasty. Calligraphy is known as "Han Li Tang Kai". It is also said that official script originated in the Warring States period.
3) Official script is basically evolved from seal script, mainly changing the round strokes of seal script into square folds, because it is difficult to draw round strokes on wooden slips with pigments, so the writing speed of official script is faster.