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.