Abstract: The conceptual hydrological model, which doesn't consider the spatial variation of the hydrological variable and parameter, mainly simulates the temporal process of the hydrological phenomenon in the catchment.Due to the increasing capacity of acquiring, archiving, storing, analyzing and visualizing the spatial geographical data, the distributed hydrological model, which considers the spatial variation of hydrological variable and parameter, is trend and focus in the hydrological research in the near future.In the paper the integration of geographical information system (GIS) and hydrological model are in detail discussed in two aspects:one is the integrating method of GIS and hydrological, and the other is the spatial discretion of the computational domain.In the end, the problem and future of integrating GIS, remote sensing and hydrological model are elucidated.