Xu Youzhen is good at calligraphy and is good at running cursive script. The small running script is particularly exquisite. The pen strokes are sharp and sharp, and the strokes are pressed hard to reveal the meaning of Zhangcao. The brushwork is thin, vigorous and bold, with the charm of Huai Su and Mi Fu, and strives for change. Has its own style. Gu Fu of the Qing Dynasty commented on his books: "In the early years of martial arts, I learned a lot about calligraphy, and I had a state of being incomparable to Qiluo. In the middle age, I learned to be a king, and he followed the rules, and his ancient color was pale. In his later years, he was indulgent and unrestrained. This is called learning and Huaisu, and it is also called learning. Yuan Zhang". His handed down works include "Farewell Postscript" and letters, which are collected in the Palace Museum in Beijing. His disciples Wu Kuan and grandson Zhu Yunming were personally taught and supported by him, and became the backbone of the "Wu School of Calligraphy". They both achieved high artistic achievements in poetry, calligraphy and painting.