Simulated field rainfall experiments were conducted to study the runoff and sediment production as well as soil infiltration characteristics on sweet potato and bare lands in Ziquejie terrace area.The results showed that compared to the two bare lands,sweet potato land had a much higher infiltration rate due to its high coverage and loose soil.No runoff was generated on sweet potato land during the low rainfall intensity of 0.65 mm/min,and the runoff,sediment rate and runoff coefficient reduced substantially in comparison to bare lands during medium(1.15 mm/miW and high(1.65 mm/miW rainfall intensities,showing a strong runoff and sediment reduction effect.However,it had a relatively higher sediment concentration with the value being 1.3 and 2.8 times of bare lands,respectively.In the current study,runoff,sediment,and infiltration processes fitted well by power functions.The sediment rate was linearly correlated with runoff rate.