Zhang Zhi was a famous calligrapher in ancient China, and was called "the sage of grass" by later generations. He was born in an indecent year and died in the third year of Chu Ping of Emperor Xian of Han Dynasty (about AD 192). Zhang Zhi was good at Cao Zhang in his early days, but there were few works by Cao Zhang in his later years. Some experts have analyzed that Zhang Zhi should have changed in a special era, getting rid of the old habits of the past and stippling Cao Zhang.
Experts who studied Zhang Zhi in later generations said that he changed because he "learned the methods of Cui (Yuan) and Du (Cao), so it was a surprise to change it to modern grass. The font is made in one stroke, occasionally interrupted, with continuous blood and even staggered veins. "
The name "Cao Sheng" originated in the Three Kingdoms period, when a calligrapher named Dan Wei called Zhang Zhi "Cao Sheng" for the first time. There are only three calligraphers in the world: Wang Xizhi, Zhong Yao and Zhang Zhi, and the rest are not satisfactory. Since then, the name "Cao Sheng" has spread and been heard for thousands of years.