Abstract:In order to provide basis for the management of Dianchi Lake and for the conservation and utilization of water resource of Kunming in the coming days, taking Panlong River basin in the downtown of Kunming, Yunnan Province as the study area, adopting the SWAT model to simulate the runoff of this basin and uploading the data including DEM of the basin, earth utilization and the type of the earth to it, choosing the years from 1999 to 2004 as the model’s parameter calibration period and the years from 2005 to 2007 as the model’s validation period, the upstream and the downstream are simulated respectively and the results of the simulation are compared and evaluated. The results show that the R2 and Ens of upstream drainage basin are above 0. 83 and 0. 80 respectively, and the R2 and Ens of lower drainage basin are above 0. 70 and 0. 58 respectively, which means the model is of good adaptability to Panlong River basin and is able to simulate and predict the water volume, water quality, silt of the drainage basin under different land utilization circumstances.