Research on Optimal Quality-cost ModelLIU Dong-cai1,LUO Zheng2,ZHANG Wen-hua2(1.Wuhan Water Authority,Wuhan 430014,China;2.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)The optimal quality-cost model was researched to control the quality cost.On the basis of analyzing Feigenbaomu optimal quality-cost model and the Zhulan optimal quality-cost model,a quantificational and operational quality-cost model was proposed.The parameter estimation method was also offered,and then the optimal quality-cost model was derived.optimal model;quality-cost model;quantificational