[Objective] The slope erosion response of engineering deposits occurring under continuous runoff scouring was determined in order to further understand the laws governing erosion of engineering deposits during continuous scouring, and to provide basic data as a reference for accurate predictions by soil erosion models. [Methods] We set up three drainage gradients (8, 12, 16 L/min) on three slopes (28, 32, 36°) and carried out three consecutive envent runoff scouring tests (24 h between each envent). [Results] ① The runoff characteristics of each envent followed the order of envent 3 > envent 2 > envent 1, and the increase in runoff in envent 3 was greater than in envent 2. The growth rates in envent 1 were 40.5% and 33.4%, respectively. ② The sediment yield followed the order of envent 1 > envent 2 > envent 3, and the proportion of sand production was 31.74%~53.46%, 29.03%~43.71%, and 17.42%~29.04%, respectively. ③ In any flow section, the average flow velocity under continuous runoff erosion had nothing to do with the change of the channel width, and the flow velocity along the runoff direction was consistent with the change of the channel depth. [Conclusion] As water flows from above, runoff on the slope surface of engineering deposits increases with increasing scouring time, and sediment yield decreases with increasing time and the scouring site has a significant impact on the average runoff rate.