The poetic theory of ancient Yi is rooted in Yi’ s cultural ecology and is the artistic summary of the poetic creations of Bimos,priests and the Yi people. The poetic function theory of ancient Yi has a deep influence on the development of Yi ’ s poetry and literature. By interpreting the universal significance and value of the poetic function theory of ancient Yi, the theory not only reflects special expressions of the poetic theory of ancient Yi,but also enriches the multiple connotations of Chinese poetics with its academic implication and distinctive style.