The paper evaluates the quality, quantity, development and management of water resources in Pingxiang City. It analysis the water resources demand of every areas in different periods by economic development planning and possible development of super-normal conditions. We also establish the Pingxiang City water resources optimal distribution model by large scale system, optimization theory and node analysis. The paper simulates and analysis the water resources demand in different period and areas, formulate a sustainable development water resources allocation scenarios. We also optimal allocate the water resources of Pingxiang City in 2015 and 2020.The method and conclusion can provide a scientific decision-making of scientific project planning, water saving and regulation for Pingxiang City.