This paper presents an optimization method for finding noninferior solutions of multiobjective multireservior problem with stochastic inflows. Constraint technique, decomposition iteration, and simulation analysis are conjunctively used to deal, respectively, with multiobjective optimization (or vector optimization), large-scale multireservoir system, and stochasticity of inflows, which represent three difficult points in water resource system analysis. The effectiveness of the method is justified by applying it to the modeled multireservoir system in Tone river basin.