The relationship between sediment yield intensity of red soil slope erosion and runoff energy consumption was studied by using mobile rainfall erosion tank for flushing test，and the critical average runoff energy consumption of soil erosion was obtained.The results show that the slope runoff energy consumption is obtained by using the principle of energy conservation.With the same runoff energy consumption，the greater the slope，the greater the sediment yield intensity.Establish the relationship between slope sediment yield intensity（Dr）and runoff energy consumption（△E），which has a good linear relationship：Dr=6.3573△E-55.339，which can be used to estimate slope sediment yield intensity；soil erosion has a certain critical runoff energy consumption.Within the scope of the experimental study，it can be obtained that the critical average runoff energy consumption of red soil slope erosion is 8.7J/min.