The solution ways of the crisis of the city water resource shortage are discussed from the viewpoint of whole processe of social cycle of water. It is pointed out that the possible ways to pass the crisis of city water resource are as follows ： treatment and reuse of urban wastewater and industrial wastewater, saving water, pollutant removal treatment of drinking water, good quality water for effective use, reasonable allocation of water, utilization of rainwater and seawater, and long distance transfer of water on the basis of full demonstration.