Huang Tingjian divided Su Shi's calligraphy into early, middle and late periods: charming in early years, vigorous in middle age and depressed in old age. As an early representative of Zhipingtie, his brushwork is exquisite and his words are charming. The middle-aged representative is "Huangzhou Cold Food Poetry Post". This poem post is two poems written by Su Shi when he was demoted to Huangzhou in the fifth year of Yuanfeng (1082) because of Wutai poetry case. Poetry is gloomy and desolate, but it is broad-minded. The color of brush and ink in calligraphy also changes with the context of poetry, ups and downs, extraordinary momentum, and one go, reaching a near-perfect state of "both hands are smooth". Therefore, the book of Xian Yu in the Yuan Dynasty was called the "third running script in the world" after Wang Xizhi's Preface to Lanting and Yan Zhenqing's Sacrifice to His Nephew. . In his later years, his representative works include the running script Ode to Dongting Spring and Ode to the Old in Zhongshan and Song Dynasties. These two poems are elegant and smart, plump and rigorous, which embodies the characteristics of Su Shi's calligraphy. The latest ink is Xie Essay (1 100).