With some rainfall erosion data measured in 7 years from 1983 to 1989 in No.3 Te-sting Field (by bare land) at xiaoliang water and soil conservation station as theresearch contents, computer techniques are used to make a rather detailed analysisof kinetic energy of rainfall erosion at xiaoliang water and soil conservationStation. Also, a benefit discussion was made on rainfall types, erosion kinetic energy produced by instant rainfall, intensity thereby to cause soil erosion in thispaper. At the same time, the critical rainfall intensity to cause soil erosion i.e. thebottom value (X) of erosive rainfall was described quantitatively, i. e. X = 9.4mm(rainfall in one time), I₃₀ = 8.7mm/h or I₅ = 20.6mm/h. When using universalsoil loss equation,the necessary modification was made to rainfall factorat XiaoliangWater and Soil Conservation Station, and also the coefficients of comprehensiverainfall typs in various cases were given. Meanwhile, based on the regressionanalysis, the simulation equation between instant rainfall intensity and the amountof corresponding soil erosion was established with a high reliability.