Written by Ye Xie in Qing Dynasty. This book is divided into two parts, inside and outside, and each part is divided into two volumes. Inside is the principle of poetry, in which the origin of the first volume is changing, that is, the development of poetry; The second volume discusses the ability of statutes, that is, the creation of poetry. The external part is poetry criticism, mainly about the beauty and evil of my poor work. The three main parts of the theoretical system of "original poetry" are the positive change of origin, the ability of statutes and the stupidity of beauty and evil. Regarding the origin of poetry is changing, Ye Xie said: "Poetry has its source, its flow, and its foundation will reach its end; There are also those that trace back to the source because of the flow and return to the original after the end. There is no end to learning, and the reason is sunrise. It is to know that poetry is the Tao, and not a day goes by without meditation and rest. But for a while, there will be ups and downs; As far as the times are concerned, prosperity will inevitably decline and will be revived from the decline. If you are not in the former, you will live in prosperity, and the latter will live in decline. "This view of the history of poetry development denies the retro argument that the former is positive and will flourish, while the latter is changeable and will decline, but" the origin of poetry is changing from beginning to end, and the ups and downs are cyclical. "Based on this circular historical view, Ye Xie's affirmation of development and change is very limited." "Different elevation" is only "poetic style, rhythm and tone", but the elegant and honest poetry teaching and elegance cannot be changed. At this point, Ye Xie took great pains to classify 300 essays and Du Fu as "thriving but enduring", regardless of his own view that "ups and downs are cyclical". Such development and change can only be due to the internal changes of orthodox feudal literature. In terms of the statutes and abilities of poetry, Ye Xie proudly selected the talents, courage, knowledge and strength of "I" and the principles, things and feelings of "things", which were reflected in the fourth and third place of "I" respectively. This is the fundamental law of poetry. Reason, things and feelings are based on reason, and things and feelings are the purpose; Talent, courage, knowledge and strength. Knowledge is the body, which determines talent, courage and strength. In this way, "balancing my four with three things" has basically become the principle of reflecting the understanding of "things" and "I", which is not the fundamental solution of poetry. Therefore, Ye Xie divided "reason" and "matter" into "reason of famous sayings" and "reason of famous sayings", "visible things" and "invisible things", and poetry mainly embodied "reason of famous sayings" and "invisible things". Only those things that can't be known, things that can't be seen and feelings that can't be reached, then you think about reason, imagine things and think about feelings. This is the language of reason, things and feelings. "This description seems to be self-evident. In fact, Ye Xie's so-called "reason" means "Tao" in the Six Classics, and "knowledge" naturally means knowing the Tao in the Six Classics. Understanding "reason" and "knowledge" in this way, Ye Xie skillfully implemented the "Tao" of the Six Classics as the inner spirit in his poetry creation. Regarding the beauty and evil of poetic works, Ye Xie expressed it more clearly than Jiang Zhai's poems in the Preface to Collected Works: "Writing is the Tao, and we should distinguish right from wrong, not the works. Clumsy and indecisive, there must be right and wrong. My humble work is inhuman, and right and wrong are based on heaven. So clumsy work can be forced, and it is not mandatory. Those who don't work, those who don't work, and those who don't work are ignorant. Ye Xie regards right and wrong as the basic standard of poetry criticism, emphasizing quality over prose and content over formal beauty. Ye Xie integrated materialism and dialectics into Confucianism to discuss poetry, which enhanced the theoretical nature of the original poem, but "the theory of generalization is the body of discussion, but it is not the body of poetry criticism." (Summary of the Catalogue of Sikuquanshu (volume 1997))