Liu Dakui (1698— 1779), a native of Tongcheng, Anhui. Zhu Sheng, during the Yongzheng period (1723- 1735), gave two assistant students, and during the Qianlong period (1736- 1796), he should have learned a lot, but none of them succeeded. In his later years, he taught in Yixian for several years, then returned to his hometown and was frustrated all his life. Liu Dakui is famous for his writing talent. In his early years, he toured the capital in cloth. Fang Bao read his article and was very impressed. He said, "If it's a bud, it's not enough! Son of Yi, a national scholar. " Yao Nai, one of the founders of Tongcheng School, once studied ancient Chinese. His literary theory advocates "the truth of meaning, volume, classics and writing, and if writing is another matter", emphasizes the unity of spirit, syllable and writing, and attaches importance to the artistic expression of prose, which is the development of the other party's literary theory. Liu's prose is good at momentum, full of literary talent, full of complaints and criticism at that time. Gong Yi's poems are often praised by contemporary people. He is the author of Liu Haifeng's Poetry and Prose and My Prose. There is a biography of the draft of Qing history.