In this study, the soil erosion process and erosion amount were simulated by KINEROS2 model according to the artificial simulation test of the runoff plots with different slope length (1，5，10，15，20 m) under different rainfall intensity (25，50，75 mm/h). The effects of different slope length, rainfall intensity and their interactions on soil erosion process and erosion amount were analyzed contrastively, and the simulation results and applicability of the KINEROS2 model were also evaluated. The results showed that the slope length was linear with the total runoff（R2＞0.990）, and a power function relationship existed between slope length and total erosion amount（R2＞0.900）. The total runoff and total amount of erosion increased in multiples as rainfall intensity increased, and the increasing rate in total amount of erosion was 2～3 times higher than that of total runoff. There was an interaction between slope length and rainfall intensity, which showed a positive effect on slope runoff and erosion process. The effects of slope length and the interactions of rainfall intensity-slope length on slope erosion amount were more obvious than that of rainfall intensity. The simulation of runoff process and total erosion amount based on KINEROS2 model were better than that of erosion process and total runoff, respectively, indicating that the KINEROS2 model was more suitable for the simulation of runoff process and total erosion amount. Generally, the KINEROS2 model had a better simulation effect on slope soil erosion process and erosion amount of runoff plot, which showed that KINEROS2 model had good applicability in plots scale in arid and semi-arid areas, northwest China.