A field water-scouring experiment was conducted with different flow rates (35 L/min, 45 L/min, 55 L/min) and different slope gradients (24°, 28° and 32°) in order to explore spatial-temporal characteristics of runoff and sediment yield on slopes of engineering accumulation body. The results showed that the runoff intensity was closely related to the intensity of discharge and sediment yield, and multiple linear correlations existed between them. The runoff intensity showed a fluctuated increasing trend with the increase of scouring time. Average sediment amount and sediment yield ratio increased at first and then decreased with the increase of slope gradients, and the peak value appeared when the slope gradient was about 28°.Runoff intensity and sediment yield showed the first peak values at 10 min. The sediment yielding process included3 stages: sediment yield rapidly increase, fluctuated and steadily developed. The cumulative sediment yield showed linear correlation with the cumulative runoff. The experiment results may provide validation data for the prediction model of soil and water loss in the production and construction projects.