Abstract: The literary trends of pursuing styles of ancient poems and prose in the middle of Ming Dynasty, which led poems and prose's creations falling into dire straits, and literary criticism was also not emerge any new thoughts. After Li Zhi made the Concept of ‘innocent mind’, this concept created a new situation of thoughts enlightening both on philosophy and on literature. Li Zhi raised the status of light literature by using the pattern of marginal remark, so that promoted prosperity and development of novels and dramas in that era.His theory has enlightening meaning and far-reaching influence.