Xian Yushu (1257 ~ 132), whose name was Bo Ji, was a sleepy mountain man, sent straight to an old man, was a native of Yuyang (now Jixian County, Beijing), and Dr. Guan Taichang, and Zhao Mengfu admired his calligraphy very much. He once said, "Yu and Bo Ji's classmates cursive, but Bo Ji has gone too far, and he has tried his best to catch up with him." "Old people who are tired of learning are good at learning, so their books are round and energetic, or they can use the Tang method more. However, during the fifteen or six years since they met Bo Ji, they have seen that their books are different from each other, and they are better than the common books in the world." The calligrapher Chen Yi once said: "Today, only a doctor is good at learning, and I ask: courage! Dare! Bold! " It can be seen that he dares to innovate. His regular script "Li Yuan Gui Pan Gu Xu" is now in Shanghai Museum, with simple brushwork, rigorous font and great boldness of vision. His own poems "Zan Da Zi Shu Juan" and "Cao Shu Juan Tang Poetry" written in cursive script are even more irregular. If this volume is different from Xian Yushu's "Zan Da Zi Shu Juan" and "Du Shi Juan" (now in the Forbidden City)