Supported by the Natural Science Foundation of Zhumadian, Henan, China(11704);Supported by the National Natural Science Foundation of Shandong Province(60973042);Supported by the Natural Science Foundation of Shandong Province(Y2008F61, Y2008G20)
P-sets is a set pair, it is composed of internal P-set and outer P-set, it has dynamic characteristic. By using structure of P-sets, dependence theorem and identification theorem are proposed in this paper.