It is generally believed in the academic circles that the literary nature is a prominent feature in the innovation of the theory of Shi Jing (the Book of Songs) in the Song Dynasty. Endorsement (代言), Generalization (泛言), Imagination (设言) and Hypothesis (托言) are the commonly used explanatory words in interpreting poetry, and a great deal of terms in literary criticism exist in the texts of Song Dynasty, which reflects the scholars’ attention to the literariness of Shi Jing, such as the narrative structure, emotional implication and fictional imagination, which is obviously different from the interpretation from the perspectives of Confucian classics and historiography. These innovative literary factors appeared in Maoshi Zhengyi(《毛诗正义》) at the latest, which indicated that the theory of the Song Dynasty is inherited rather than separated from the Han and Tang Dynasties. However, due to the limitation of the cognitive level of the times, and with the conflict between the innovative ideas and the traditional Confucian classics, there are still many contradictions in these views that need to be improved.