Cursive script is a fast and convenient calligraphy style that emerged from the development of Chinese calligraphy to a certain period. It began in the early Han Dynasty. What was popular at that time was Caoli, which later gradually developed into "Zhangcao". It is said that "Zhangcao" got its name from Emperor Zhang of the Han Dynasty who ordered his minister Du Du to write memorials in this font. Some people say that "Zhangcao" was created by Emperor Zhang of the Han Dynasty. Others say that "Zhangcao" got its name from the calligrapher Shi Youyong during the reign of Emperor Yuan of the Han Dynasty. This font is written "Jijiucao". In short, "Zhangcao" was very popular in the Han Dynasty. At the end of the Han Dynasty, Zhang Zhi, a great calligrapher, emerged. It was he who got rid of the traces of official calligraphy retained in "Zhangcao". The strokes between the upper and lower characters are often connected, and the radicals are borrowed from each other to become "jincao", which is commonly known as cursive script. In the Tang Dynasty, Zhang Xu and Huaisu wrote "Jincao" in an indulgent and open manner, with continuous and winding strokes and dramatic changes in character shapes, which gave rise to "Kuaicao". From this we can see that Zhang Zhi is the ancestor of "Jincao"; Zhang Xu and Huaisu are the ancestors of "Kuaicao".