On the relation between"one"and"Tao",Xunzi put forward the theory that Tao comes from one and is always changing.On the relation between"one"and"many",Xunzi summarized and grasped the class of knowledge and unification,thought that li belongs to the one,and explained the theory of humanity.In the relationship between"one"and"one"(single-minded),Xunzi put forward the unity of one,empty one and quiet,and achieved a breakthrough in epistemology.On the relationship between"one"and"micro",Xunzi put forward the work theory of carrying on the small and accumulating the small to become a saint.Xunzi's"One"theory contains the theory of heaven,humanity,epistemology and the theory of effort,which marks the distinct theoretical characteristics of compatibility,inclusiveness and criticism of fusion and casting.