There is no founder, it evolved. It was formed in the Han Dynasty and evolved on the basis of official script for the convenience of writing. There are Zhangcao, Jincao and Kuangcao. Zhangcao originated in the Western Han Dynasty and flourished in the Eastern Han Dynasty. The handwriting is in the form of official script, and the characters are distinct and not connected with each other. There have been different interpretations of the name of Zhangcao in the past dynasties. It is most ridiculous to say that Zhangcao got its name from the chapter character in "Jijiuzhang" after seeing that "Jijiuzhang" has been written in cursive since the late Han Dynasty. Some people say that Emperor Zhang loved cursive script or ordered memorials to be written in cursive script. It is even said that Emperor Zhang created cursive script. This is all speculation. There is a saying that the chapter of the constitution is synonymous with the chapter of the constitution book and the regular script, which is in line with the fact that early cursive script has a slight eight-point brushstroke meaning, the characters are not related to each other, and there are rules and regulations to follow in the omission of strokes. Many people in recent times believe this theory. There are two theories about when the modern grass originated: Zhang Zhi in the late Han Dynasty and Wang Xizhi and Wang Qia in the Eastern Jin Dynasty. Judging from the handed down tables and posts, as well as the unearthed Han bamboo slips and Han bricks, it can be seen that at the end of the Han Dynasty, when the eight-point script was used as the regular script, writing methods that approximated the real script had already appeared. Cursive writing will also mutate accordingly. Cui Yuan, a cursive calligrapher who was slightly later than Zhang Zhi, wrote "Cursive Script Shi". He said that cursive script "looks like a series of beads, never separated", "the last stroke ends with momentum, and the rest is tangled", "the head does not hang down but the tail hangs down", and "the subtlety and subtlety are important". The description of "whatever is appropriate at the moment" shows that the cursive writing style of the late Han Dynasty was smooth and no longer rigidly adhered to the rules. There are no clear divisions in the evolution of calligraphy styles. To say that Jincao arose from Zhang Zhi is to look at the germination of the new style; to say that Jincao arose from Er Wang is to focus on the formation of typical styles. Since the Tang Dynasty, real books have been used to this day. In the Tang Dynasty, cursive script appeared, represented by Zhang Xu and Huai Su, and became an artistic creation that was completely divorced from practicality. Cursive script, also known as big cursive script, has unrestrained writing style and continuous style, such as "Thousands of Texts Broken Stele" and "Ancient Poetry" by Zhang Xu of the Tang Dynasty. "Four Ways", Huai Suseng's "Autobiography", etc., Zhang Xu was called the "Cao Sage" in history, and Sun Guoting's "Book Book" has different words and is not connected, but the writing style is lively and beautiful. "Big grass" and "small grass" are relatively symmetrical. The big grass is purely made of grass and is difficult to identify. Zhang Xu and Huaisu are good at this. Their characters are written in one stroke, with occasional discontinuities, but the blood flow is continuous. Feng Ban's "Buoyin Shu Yao" of the Qing Dynasty said about learning cursive calligraphy: "Learn Xianzhi from small grass, learn from Xizhi from big grass. It is better to learn Huaisu from Zhang Xu than from Kuangcao." Huaisu's cursive calligraphy is easy to recognize, the handwriting is thin and visible, and the joints between the words are also clear and easy to write. Zhang Xu's glyphs change a lot, often with a number, and the momentum between the lines is constant and difficult to identify, forming a unique style. Han Yu's "Preface to the Master Gao Xian" mentioned that Zhang Xu's cursive script is "happy, angry, embarrassed, poor, worried." Sadness, joy, resentment, yearning, drunkenness, boredom, and injustice, if they are moved in the heart, must be expressed in cursive script." Therefore, it is difficult to learn from Zhang Xu. Derivatives and Development In recent times, it is common to see official script with an elegant style of cursive brushwork, which is called official script, and some resemble Zhangcao. This is related to the fact that people are good at writing official script and are proficient in writing official script. Therefore, official script can create a unique style. It is also a way of writing performances.