The main trend of the Chinese poetic tradition is lyricism which involves the relationship between lyricism and knowledge, making clear whether the tradition was lyric\|oriented or knowledge\|oriented, and thus forming lyric exposition and knowledge exposition. The discourses of lyricism and knowledge were developed in the history of Chinese poetics. The Tang poetry had a lyric\|oriented tradition, while the Song poetry had a knowledge\|oriented tradition. The turn from the Tang poetry to the Song poetry was actually one from lyricism to knowledge. The history of the Song poetry was divided into three periods: inheriting, departing from and returning to the tradition of the Tang poetry, which was, in the sense of poetical thought, a process from the inheritance of the lyric tradition, to the construction of a knowledge tradition, and then to the reconstruction of the lyric tradition. The relationship between lyricism and knowledge was the focus in the history of the Song poetry and poetics. The post\|Song poetic circles, no matter whether they inherited the Tang poetic tradition or followed the steps of the Song poetic tradition, were all faced with the issue of how to handle the relationship between lyricism and knowledge.