Han Shijun. It was Han Shijun who won the special prize in the Hard Pen Calligraphy Competition for his Dongpo Calligraphy Theory. "On Calligraphy" is excerpted from "Dongpo Collection", including Su Shi's "On Calligraphy", "On Calligraphy of Ancients", "Self-Lunk on Calligraphy" and other materials discussing calligraphy. Su Dongpo's calligraphy came up with new ideas and was not limited to established methods or superstitious about authority. He pointed out that "there is no fixed method for holding the pen, and it must be imaginary and broad." He emphasized that the writing should be appropriate without certain rules, and should be free under the premise of practicality. Free, unrestrained, free to use for one's own use.