In this paper, the preparation of goat plancenta immunoregulatory factor(GPIF) avivity samples, the comparison among several methods for evaluating immunobiologic activity and the choosing of optimum methods have been systematically studied. On the base of these, we have evaluated the immnobiologic acitivity of GPIF, finded the dose-effect activity curve of GPIF; and analyzed influencing factors of different grafts, disposal means on GPIF immunobiologic activity. Further, we compared GPIF immuno...