SWAT is a river basin,or watershed scale model developed to predict the impact of land management practices on water,sediment, and agricultural chemical yields in large, complex watersheds with varying soils, land use,and management conditions over long periods of time. The model is physically based and computationally efficient,uses readily available inputs,and enables users to study long-term impacts. On the base of simple introduction of this model,monthly and daily runoff of the Yunzhou Reservoir Basin in 1980s is simulated under the condition of land use of 1980s in the paper. The result indicates that the model efficiency is 0.79, which belongs to the second level and the curve of simulated agrees with the curve of measured daily runoff. So it is feasible to simulate the impacts of LUCC on hydrology using SWAT model.