Zhang Xu, Huai Su. Zhang refers to Zhang Xu, a calligrapher of the Tang Dynasty, who is always called Huai Su, a calligrapher of the Tang Dynasty. Tipping refers to the characteristics of Zhang Xu's calligraphy: enthusiasm, even to the point of madness. Drunkenness refers to the characteristics of Huai Su's calligraphy: round and flying, ethereal and transparent charm. Tiaozhang Zuisu refers to a person's outstanding personality, and it is also used to praise cursive calligraphy works with the charm of Zhang Xu and Huai Su.