Rock, also known as Cliff, is the largest, grandest and most distinctive calligraphy among cliff stone carvings in China. It took the lead in popularizing "Thirteen Kinds of Shimen" in Hanzhong, Shaanxi Province, and the more distinctive of the thirteen products should be said to be "Han San Fu". Among the three Fu in Han Dynasty, from the perspective of calligraphy art, Shimen Fu has more thin parts, less fat parts, and more skillful than clumsy. "Xixia Fu" has fat strokes, thin strokes and half strokes, while "Gao Ge Fu" has fat shapes and clumsy strokes. They have their own characteristics and wonderful meanings. However, they are all works to cut the mountain to open the way and bridge the bridge, and they all praise the achievements of "Li Si, a captain", "Taishou" and their masters. Although the text is incomplete, it can still save a lot of historical materials, which provides us with good supporting materials for studying the social situation and calligraphy art at that time, which is of great significance.