Using the Yi epic to analyze the structure and cultural symbolism of Xiang Tian Fen, this paper explores the Yi Totem culture and clarifies the culture behind Xiang Tian Fen, and then discusses the concept of life and death of the ancestors of the Yi ethnic group and the natural world.It found that the ancestors of the Yi nationality, who came from nature, transformed nature, conformed to nature,and lived in harmony with nature, eventually reached the unity of heaven and man. The unity of heaven and man is a manifestation of the collective consciousness of the Yi ethnic group.The way of their dealing with life is the answers to where people come from and where to go.