The so-called "poetry is based on emotion" means that poetry is written out of emotion and is intended to express the author's feelings. In "Wen Fu", Lu Ji highly summarized the artistic law of the development of poetry in the direction of lyricism and formal beauty since Jian'an, and put forward the theory that "poetry is related to emotion and is beautiful". Lu Ji's "Wen Fu" and the theory that "poems are caused by emotions and are beautiful" emphasize the artistic nature of poetry from the characteristics of poetry, and believe that "poems are caused by emotions and are beautiful", which means that poetry is caused by emotions. born. This is the first time in the history of Chinese literary theory that it is clearly stated that poetry is the main emotion, and the main emotion is the characteristic of poetry. As we all know, "poetry" is the form and the medium to express the poet's emotions, while "ambition" is the content, the source and the soul. The theory of "poetry is due to emotion and is beautiful" has contributed to the formation of the poetry theory of "equal emphasis on emotion and will" and "equal emphasis on literature and quality" in the history of later literary criticism, further revealing the essential attributes of poetry and achieving the unity of ideological content and artistic form. Its influence cannot be underestimated. positive impact and role.