What are the important literary propositions of the Song School?

The main school of this school of poetry is "taking Kaiyuan, Tianbao, Yuanhe and Yuanhe as their careers" (Chen Yan's Shi Shi Yi Shi Hua), that is, Du Fu, Han Yu, Su Wu and Huang Tingjian are the schools. His creative tendency was influenced by Sinology, the main academic trend of thought at that time, and he "integrated the poems of scholars and poets" (ibid.), showing his unique artistic interest. Shen said that the "three principles" are the ability of foreign explorers to discover the new continent, and colonial policies can open up ports "(quoted in the same book). The release of Song poetry promoted this pioneering spirit of "three elements" and advocated that poetry should be original and unique. He, a theorist of Song School, emphasized that poetry should establish "true self" and "marry" alone. But its so-called "true self" includes natural personality temperament and acquired temperament. The latter comes from "reading from temperament" (On Feng Luchuan's Collected Poems), which generally does not reflect the feudal ethical category and the standard of honest and upright scholar-officials. Very conservative, can't be compared with the new trend of thought of the times that publicizes individuality. The main achievement of Song School is the artistic development in describing concrete life.