Regular script is also called regular script, real script and official script. It gradually evolved from official script, becoming more simplified and more horizontal and vertical. Ci Hai is interpreted as "square, straight and exemplary". This Chinese character font is correct, which is the popular handwritten orthographic Chinese character.

Regular script in the Tang Dynasty, like the prosperity of the national situation in the Tang Dynasty, is really unprecedented. Calligraphy style is mature, and calligraphers come forth in large numbers. In terms of regular script, Yu Shinan, Ou Yangxun, Chu Suiliang in the early Tang Dynasty, Yan Zhenqing in the middle Tang Dynasty and Liu Gongquan in the late Tang Dynasty all valued their regular script works and regarded them as models of calligraphy.