The study tested a soil and water assessment tool in a hilly-gullied region of China to simulate runoff and sediment. Daily data from 1998-2008 was used for calibration and validation. The model accurately simulated daily runoff but underestimated high-flow events. It captured sediment trends well but underestimated sediment during calibration and validation. Differences between observed and modeled data may be due to limitations in the methods used. The study suggests that adjustments to the model are needed to improve performance during heavy rainfall periods in runoff and sediment simulation.