Su Shi's view of appreciation is clearly reflected in his evaluation of many great calligraphers in past dynasties. Taking Yan Zhenqing as an example, Yan Shu achieved the same prominent position as Wang Xizhi in the history of calligraphy. It was not until the Song Dynasty that Yan Shu became a "poet saint" and only a poet, which reflected the changes in the mentality and aesthetic concept of the literati in the Song Dynasty. Yan Zhenqing was honest and outspoken all his life. He was not afraid of powerful people and was famous for his benevolence and righteousness. Yan Shu replaced the exquisite brushwork of Jin people with a round and vigorous brushwork, and replaced the beautiful style of Er Wang's calligraphy with a steady and dignified structure, which was magnificent and self-contained, creating a new generation of style. However, this new style was not recognized at that time until later generations. Li Yu said that Yan Shu "has a model and a law but no beauty, just like the cross between South Korea and China". But Su Shi's focus is on his style from his books. "Book title Lu Gongtie" said: "I don't want to read Gong Yan's book, but I hate reading it." [4] Yan Zhenqing's words connected him with others, and then others further affirmed the artistic achievements of his book. This is the practical application of Su Shi's appreciation theory. For example, in the postscript of Ouyang Wenzhong's Official Book, he commented on Ouyang Yunxiu: "Ouyang Wenzhong uses a sharp pen to dry ink and make square characters, which is beautiful and has endless paste.