What is "Cao Zhang"? Anyone who loves calligraphy knows that it refers to the cursive script of Zhang Xu, a great calligrapher in the Tang Dynasty. This one is amazing. He is not only good at writing the Seven Wonders, but also known as the "Eight Immortals in Wine" with the famous Li Bai and He Wei at that time. He is also proficient in calligraphy, especially cursive script. Every time I get drunk, I write wildly. With shouts, most of the things left on the white wall are ingenious, so I am respected as a cursive calligrapher by later generations.

Zhang Xu (date of birth and death is unknown) was born in Wuxian County (now Suzhou, Jiangsu Province) in Tang Dynasty, and was born in Kaiyuan and Tianbao. He was once the prefect of Changshu County and had been friends with Wu Jin for a long time.

It is famous for its cursive script, and it is equal to Li Bai's poems and Pei Min's sword dance [1]. 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.