Rapid urbanization has brought about a series of new challenges for local sustainable development, especially for urban rainwater management. To meet such challenges,it is necessary to manage urban rainwater in an informationized and intelligent way, aiming at the maintenance of natural hydrological cycle. This paper proposed a framework of urban water information management system based on analyzing the necessity and feasibility. As urban rainwater-oriented information system, it should be capable of outputting and managing the basic data of the natural conditions in an urban area, such as those about urban topography, geomorphology, vegetation and soil. Meanwhile, it should have functions of outputting and managing data directly related to rainwater management, like hydrological location, land use, average precipitation, maximum rainfall duration, and minimum duration without rainfall. Key component of this system is its spatial analysis module. Both selection and distribution of any rainwater management module are based on conducting spatial analysis of various data mentioned above. Practical effects of different kinds of management modules and facilities can be simulated and visualized by using this system.