In fifteen years (1889), Kang Youwei wrote a book, Guang Yi Zhou Shuang Tan, which comprehensively and systematically summed up the theory of stele, put forward the theory of "respecting stele", and strongly praised the stele study in the Han, Wei and Six Dynasties, which had a far-reaching impact on the prosperity of stele calligraphy. Fu Zhuyun: "The South China Sea is deeply involved in calligraphy, and the book" The Double Collection of Guangyizhou "is quite elaborate. The book cover is pure and simple. Therefore, it can wash the mundane and unique style. However, if you don't store it, you will benefit from it. It is not as good as what you say. "