Zhang Xu was born in Wuxian (now Suzhou, Jiangsu) in the Tang Dynasty. He was still alive when Kaiyuan and Tianbao were alive. He is the magistrate of Changshu County and the long history of Jin Wu.
It is famous for its cursive script, and it is said to be three wonders with Li Bai's poems and Pei Minzhi's sword dance. Poetry is also unique, famous for its seven wonders. It ranks alongside Li Bai, He and others as one of the Eight Immortals. Together with He, Zhang and Bao Rong, they are called "four sons of Wuzhong". Calligraphy is as famous as Huai Su.
Good sex wine, according to "Old Tang Book", every time you get drunk, you scream and go crazy, and writing is called Zhang Dian. It also shows that he is crazy about art and was called "the sage of grass" by later Buddhas.