Huai Su was born in the flourishing age of Li Tang, which was an era when the subject spirit had relatively free space. This "Lingling monk" is not bound by the rules and regulations of Buddhism. He wrote "Eating Fish Post" in Chang 'an, telling himself to drink and eat meat all day. Although he was laughed at continuously, he still went his own way. Huai Su was a natural alcoholic, and "wine" made his blood boil. The transcendence spirit of Zen is naturally integrated with the Dionysian spirit. When it comes to writing, it's like a sudden storm. Although there are many changes, there are still laws. The calligraphy of eating fish sticks is elegant, round, relaxed and not crazy, and the pen and ink are clever, smart and just right, just as Wen Zhiming praised: "The collection of true books is like a monk entering a holy place, and there is nothing wrong with madness." The style is between the original Bitter Bamboo Shoot Post and Song Tuoben's Fagong Post, and the knot is also close to Song Linben's Autobiographical Post. Xu Bangda's "The Record of Gu Shuhua's Passing Eyes" thinks that the strokes are a little dull, and the dry pen has traces of slow tracing, which should be half-written and half-copied. However, the skill of copying is superb, and only Long Live the Mail copied by Tang Dynasty can match it. The well-structured strokes keep the face of Huai Su's calligraphy. As far as Gao Gu's works are concerned, the early manuscripts have the same academic value as the original works. Eating Fish Sticks, Bitter Bamboo Shoots Sticks, Self-narrative Sticks and On Book Sticks are all four great works of Huai Su's ink painting.