Main body literature theory" can show the unique pureness of literature theoretical self-value in Chinese present literature. This paper focuses on the writer of the theory, Hufeng and Liu Zaifu and makes comparison from the aspects of writer self, times background, and theoretical intension. This paper is the first part of full text and analyzes the formation background of "Main body literature theory". It puts forward the poetry disposition and oriental and occidental writing theory are the major factors of producing the theory.