Abstract: Due to the limitation that the objective weight or subjective weight is considered separately in the multi-objective deci sio n-making,the concept of a tradeoff coefficient is imported,and a fuzzy iteration methodology paying attention to subjective and objective decision-making,which,at the same time,gives a objective weight and the relative membership degree of alternative,is presented in this paper.Since this rmdel takes into account,in the meantime,the objective intent of decision-maker and the natural property of alternative,the ranking of alternative is more feasible and reasonable then former method.Rnally,a case is applied in the appraisal of reserwir flood control to show that the model is scientific and practical.