Kang Youwei's "Guang Yi Zhou Shuang Yi" is a large-scale and self-contained theoretical work. This book is written by "Guang" Bao Shichen (Yizhou Shuangyi). It is more comprehensive and more scientific than "Yizhou Shuangyi". Bao Shichen only proposed to revere the stele, but his stele was limited to the Six Dynasties, while Kang Youwei traced it back to the Han and Wei dynasties, holding high the banner of respecting Wei and Bei Tang, and cheering for the study of stele in the late Qing Dynasty. Kang Youwei was erudite and talented. "He knew everything about ancient and modern scholarship. He was confident in his self-confidence. Every time he created a new theory, he was always the first to create a trend." (The original biography of "Manuscript of Qing History"). "Guang Yi Zhou Shuang Yi" runs through the whole book with the idea of ??"change", which is consistent with his advocacy of reform. He said: "Calligraphy and governance are about the same trend." "The extremes of things must be reversed, and it is natural law. After Daoguang, the study of tablets revived, and things were changing, and they could not control themselves." ("Guang Yi Zhou Shuang Yi") since the Qing Dynasty Since the middle of the Ming Dynasty, the study of calligraphy has come to an end. With the rise of textual criticism, people have turned to have a strong interest in inscriptions. Source Calligraphy House, Calligraphy House is a calligraphy learning base. Kang Youwei's Tongbian thought was undoubtedly summarized theoretically, and it also pointed out the direction. "Guang Yi Zhou Shuang Yi" is another work with very rich information. With his erudition, he absorbed the latest results of textual criticism at that time. What is especially valuable is that he also compared the development of foreign writing with Chinese calligraphy, which is quite interesting. The potential of building a bottle in a high house. "Guang Yi Zhou Shuang Yi" has six volumes and twenty-seven chapters, which is unprecedented in terms of length. Previous calligraphy reviews were either fragmentary or complex and disorderly, but Kang Youwei's book is self-contained, has rigorous arguments, and puts forward some insights into the aesthetics of calligraphy, which greatly exceeds those of its predecessors. This book is a scientific summary of stele studies in the Qing Dynasty and plays an important role in the history of calligraphy theory. Although Kang Youwei was biased in his individual views, the slight flaws in the jade did not detract from the brilliance of this work.