One of the Collected Works of Sun Changwu. The manuscript consists of eight chapters, about 190 thousand words, and mainly discusses and reviews the prose creation of Han Yu, a writer in the Tang Dynasty. The whole book explores and studies Han Yu's prose from seven aspects: "e;Writing is to clarify the way and defend the way"e;, to spread the truth and to rejuvenate the world, to reform the style, to reform the style of writing, writing skills, literary language, influence and merits and demerits. The historical experience of literary development is summarized.