"Tiaozhang Zuisu", also known as Zhang Xu and Huai Su, were two cursive writers in the Tang Dynasty. Since the formation of the Han Dynasty, cursive script has entered a brilliant stage in the Tang Dynasty. A large number of calligraphers have studied calligraphy excessively, among which Drunk is the most successful and far-reaching one.

Zhang Xu, a native of Wu (present-day Suzhou), was born and died in the years of Kaiyuan and Tianbao in the Tang Dynasty. Guan Jinwu has a long history and is called "Zhang Changshi". Zhang Xu is most famous for cursive script, but he has carefully studied regular script, which has been passed down to this day. The exquisite regular script laid the foundation for the formation of Zhang Xu cursive script. Among the cursive writers in the Tang Dynasty, Zhang Xu was the first person to write a new style. His wild cursive script was praised by Han Yu, a writer in the late Tang Dynasty: "Love, embarrassment, sadness, joy, resentment, hope, drunkenness, annoyance and injustice will produce cursive script." Zhang Xu's wild grass calligraphy is to melt feelings into words, and his works are strange in the middle, continuous in the middle, rapid in ups and downs, and the spirit and line echo each other. Zhang Xu's Wild Grass, Li Bai's poems and songs, and Pei Min's sword dance are also called "Three Musts" in the Tang Dynasty. Zhang Xu once taught Yan Zhenqing brushwork, and Yan Zhenqing commented on Zhang Xu's cursive script: "Zhang Changshi's posture is transcendent, surpassing ancient and modern times." So it is called "Zhangdian".

Huai Su, a native of Hunan, was a famous cursive writer after Zhang Xu in the Tang Dynasty. He became a monk as a teenager and loved calligraphy since childhood. Huai Su studied calligraphy hard, and then left Hunan for advice in Luoyang, Henan and Xi 'an, Shaanxi, in order to make progress in the wild grass. Huai Su likes drinking and writing when he is drunk. His words are like a whirlwind, flying around, and his words have changed a lot without losing his brushwork. At that time, after reading Huai Su's "Weeds", Xu Yao praised him for "writing two or three lines when he was drunk, but he couldn't write after waking up." So people later called Huai Su a "drunk".

Many works of poets in the Tang Dynasty praised the cursive scripts of Zhang Xu and Huai Su. When Gao Shi described Zhang Xu in his poem, he said: "The book is self-righteous, and the words are still shaken after drunkenness." Xin Li's poem to Zhang Xu is: "Come to the wall and write like a meteor." Su Xun wrote in his cursive "Song": "Happiness is like a whirlwind, and drunkenness is more enthusiastic." These Tang poems described the creation of cursive scripts by Zhang Xu and Huai Su, which had a great influence on later generations, so people named them "Dianzhang Zuisu".