Based on field investigation of the land use, erosion distribution of an experimental forest catchment exposed to eight typical events of rainfall from 1996 to 1998 was modeled with the aid of the GIS and a number of models, which cover canopy interception, roughness of litters, SCS hydrology, sediment calculation and transferring rate of runoff plot.The results show that the event sediment of bare lands and water resource protection forest accounts for 92.47%~100% and 15.23%~7.53% of the total erosion sedimentation, respectively.Verification of the models based on the two typical events of 1997-07-31 and 1998-07-05 indicates the error of simulated runoff discharge and sediment were -3.24%, +10% and +32.3%, +39.34%, respectively.