Pointed to Wujiaqu City facing the water use problems with rapid development of socio-economic, mult water sources, multi-water users, increasing the water use contradiction between industry and agriculture, the paper adopted the multi-objective decision-making method to establish a water resources optimal distribution model with the objective function as minimum water shortage and water diversion costs. It carried out the water resources planning for the future planning years (2015,0) of Wujiaqu City. The results of optimal allocation is reasonable and has the advantages of practicality and cordination.