This paper analyzes the characteristics of water resources in an ecological residential district of a city.Recognizing the principle that water could recycle,the paper proposes that constructions of a collecting system of rain water,sewage and reuse of water in the middle management processes,and a management system can achieve water circulating usage in a district.Simultaneously,it is a useful approach to find new energy sources.Constructing such a district and strengthening water re-usage are not only a fundamental approach to solve the contradiction of water supplying to water demanding,but also a powerful safeguard for city ecological environment.