In the era of digitalization and intelligence, it is of great significance to represent the inherent structure of ancient literatures to organize the knowledge elements among them. Based on the discussion of the reviewing the traditional literature classification methods, this research shed light on the theoretical basis and realization path of the internal structure representation of ancient literatures. Thus, we expect to provide reference for the knowledge organization of ancient literatures. Due to the limitations of the method of ancient literatures classification and ordering, based on analyzing the differences between literature classification and knowledge organization, this paper proposes that literature classification and knowledge organization are essentially the structure of record resources, however, the literature classification is a kind of record resource ordering based on the formal characteristics of document carriers, while knowledge organization is a kind of ordering based on the content elements of ancient literatures. The future of knowledge organization of ancient literatures will transform from static retrieval to dynamic representation.