Based on the field monitoring data of runoff plot in erhugou small watershed from 2014 to 2016, under the condition of the surface soil (0-20 cm) in the pisha sandstone area, the soil parameters of the model were calibrated by the cumulative error method; at the same time, the model validity coefficient (ME) and the decision coefficient (R²) were used to verify the model validity, and WEPP model was used to simulate the runoff and sediment conditions of different erosion control measures. The ecohydrological effects of runoff and sediment reduction were compared and analyzed. The results showed that:(1) When the effective hydraulic conductivity, critical shear force, and erodibility of rill soil are 4.73 mm/h, 1 Pa and 0.01 m/s respectively, the simulation effect of the model is the best. (2) The R² and ME of WEPP model to simulate runoff and erosion of no measure (bare land) plot were 0.722 3 and 0.616 0, 0.702 5 and 0.616 7 respectively, and the runoff and erosion of WEPP model to simulate measure (grassland) plot were were 0.711 6 and 0.674 1, 0.844 7 and 0.690 3, respectively, and the simulation effect of the model with measures was better than that without measures. (3) Under different rainfall types, the effects of scenario a (herbage with low coverage on sunny slope), scenario b (shrub with low coverage on sunny slope), scenario c (shrub with medium coverage on sunny slope), scenario d (shrub with high coverage on cloudy slope), scenario e (shrub with high coverage on cloudy slope), and scenario f (shrub with low coverage on cloudy slope) on runoff reduction were 13.04%~91.28%, and the effects of sediment reduction were 44.46%~99.98%. In general, the effects of different scenarios were:scenario d > scenario e > scenario c > scenario f > scenario b > scenario a.