In order to deeply understand the soil erosion mechanism of ridged farmland on brown soil,this paper used a 1.60 m×0.53 m test soil trough and designed two rainfall types,namely,intensive-type (70~70~100~100 mm/h) and reduced-type (100~100~70~70 mm/h),and artificial simulated rainfall tests on 2 slopes (9° and 18°). Each rainfall type is divided into two phases (phase I,phase Ⅱ),and two sessions of rainfall of the same raininess at each stage,and each session of rainfall lasts 20 minutes. The results show: (1) Raininess has a significant effect on runoff (P <0.05). Runoff at 100 mm/h rain intensity is greater than 70 mm/h. Under the reduced rainfall type,the slope has a significant effect on runoff (P<0.05),while under the intensive rainfall type,the slope at different stages has different effects on runoff. (2) Raininess has a significant effect on sediment yield (P<0.05). During the rainfall of Phase I,the average sediment yield per minute at 9° and 18° slopes at 100 mm/h raininess was 23.98 times and 9.07 times of 70 mm/h raininess. Under 70 mm/h raininess,the slope has a significant effect on sediment yield (P<0.05),while under 100 mm/h raininess,the slope at different stages has different effects on runoff. (3) The time sequences of 100 mm/h raininess in different rainfall types has no significant effect on sediment yield (P>0.05); under 70 mm/h raininess,the overall sediment yield is smaller,basically below 15 g/min.The time sequences of the same raininess in different rainfall types had significant effects on runoff (P<0.05). (4) The total runoff is as follows: 9° reduced-type > 18° reduced-type > 9° intensive-type > 18° intensive-type; the total sediment production is in descending order: 18° intensive-type > 18° reduced-type > 9° reduced-type > 9° intensive-type. Under different rainfall type,after the change of rain intensity,the cumulative runoff and cumulative sediment yield increase rate and the change of rain intensity are consistent.