Dian Lun is a collection of political, social, moral and cultural essays he wrote when he was the king of Wei at the end of Jian 'an. The whole book consists of many articles. The Thesis is one of them, and Dian Lun is one of the twenty articles written by Cao Pi, the Wei Wendi. It is written in the form of "volumes" and is an anthology of Cao Pi's essays on a series of national issues. But it's a pity that most of these twenty articles have been split up to now, leaving only fragmentary chapters. Fortunately, the paper was selected by Xiao Tong in the Southern Dynasties into Selected Works of Zhaoming, and it was completely preserved.