Looking back at the history of calligraphy in China, we can see that there were no large-scale calligraphy works by Zhang Zhi, Zhang Xu, Huai Su, Huang Tingjian and other crazy grass masters because of the small paper size at that time. Although their "Wild Grass" works also dance from time to time, it is difficult to see the "continuous dry pen" between many words and large areas. Continuous multi-character or "one pen" is basically done with symmetrical ink, because fine print works do not need to use more dry pens. Later, Wang Duo and Fu Shan, who wrote big characters, seldom used the difficult technique of "dry writing" to realize the coherence between multiple characters.
Li Zhimin, a senior professor in Peking University and a pioneer who drew inspiration from calligraphers of past dynasties, creatively developed the technique of "Lian Gan Bi" and pushed it to the highest level. His dry brush is persistent, constant and not weak in the constant rotation of the center, which can be described as a "unique skill" and fills the gap in the history of crazy grass in the 20th century, so it can be highlighted in the history of contemporary calligraphy, and it can be called "the history of calligraphy of Peking University" together with Shen.