Literature theory includes creation theory, noumenon theory, and acceptance theory. The specific differences are as follows: Creation theory refers to the theory of the basic principles and methods of literary creation. It paid attention to the process of producing literary works, the psychology of creation, and the methods of creation. Ontology is the theory of existence, noumenon, and essence in philosophy. In literary theory, noumenon usually refers to the theory of literature itself and its existence. It explored the essential features of literature such as language, structure, theme, and style. 3. The theory of reception refers to the theory of literary acceptance and readers 'response. It focuses on the readers 'reaction and acceptance of literary works in the process of communication, and probes into the value and significance of literature. In addition, there were also some theories related to literary theory such as aesthetic theory, cultural theory, ideology theory, etc. They discussed literary phenomena from different perspectives, which had a profound impact on the development of literary theory.