Abstract: By applying the mix model of system dynamic multi-objective planning(SD-MOP) model,the article discussed the optimum uses of water resource in Qinhuangdao city.First,the overall development trends can be estimated based on the current development status,thus obtaining relevant information of water supply-demand.Second,according to the constraints of water resource emerged from the structural analyses of water use,the planning proposals of water use are formulated.Finally,by the running of the system dynamic model,the social,economic as well as the environmental responses are estimated reasonably based on the assumption of implementation of the formulated planning proposals.