The distributed hydrological model has become a key issue of hydrology research based on the GIS and RS technologies now. This paper introduces the SWAT (soil and water assessment tool) model from the intersection view of hydrology and meteorology. The model was applied to Bailian River valley of Hubei Province so as to discuss its adaptability in flow simulation of the mid-small valley. In combination with DEM, vegetation and soil data, and through model pre-processing, the framework of SWAT model for Bailian River valley was established. The results show that the SWAT model can reflect the daily flow hydrological process of the basin on the whole and can be adaptable for the valley.