Changchun is one of cities that water deficiency is serious in China. The contradiction of municipal water between supply and demand is great. Water pollution, water quality deterioration, water resource waste and social and environmental problems that are caused by them are very sharp. Based on analysis of existing state of water resource, the demand of municipal water and the potential of the utilizable water resource in 21st century in Changchun are analyzed in detailed, and put forward available proposals about sustainable development of water resource in Changchun.