1 Cao Sheng was a calligrapher of the Tang Dynasty, Zhang Xu, from Wuxian County, Suzhou (now Suzhou, Jiangsu). Good at cursive writing, like drinking. He is called Zhang Dian by the world, and he is also called an alcoholic with Huai Su. He and He, Zhang and Bao Rong are called the fourth scholar in Wuzhong, and he is also known as the one who drinks with others. His cursive script is as good as Li Bai's poems and songs and Pei Min's sword dance.
2. Zhang Xu was born in a family with high family background. He studied calligraphy under his cousin Lu Yanyuan, and was highly praised by Wu Daozi and Yan Zhenqing after his success. When he was old, he was promoted or recommended, recruited talents, entered the official position, and was released as a captain of Changshu County. Successive left satrap, satrap, known by the world. He died in Gan Yuan about two years later at the age of 75.
3. In calligraphy, Zhang is good at observing objective things and combining objective natural images with personal subjective feelings. He not only inherits tradition, but also dares to innovate. By inheriting and innovating the calligraphy achievements of predecessors, his own weed art reached a peak in the prosperous Tang Dynasty.