The SWAT model is a distributed hydrologic model with the ability of evaluating the hydrologic responses to climate change.Its ArcView interface version AVS2000 is applied to analyze 2000-2004 basic data observed from the Zhangweinan basin on medium scale.Based on the current climate,24 kinds of climate scenarios are set to simulate the hydrologic responses to climate change.Runoff,evapotranspiration,and water yield are selected to quantitatively analyze climate change impacts on hydrologic responses.Result from the research shows that runoff,evapotranspiration,and water yield of the basin are affected greatly by climate change.Runoff,evapotranspiration,and water yield also increase with increasing precipitation.When temperature rises,evapotranspiration increases,but runoff and water yield decrease.The research may be helpful to water resource management under climate change.