Two erosive soils,red soil and purple soil in Yangtze River basin,was selected as research objects,and K value was taken as indices of soil anti-erodibility,this paper calculated the soil anti-erodibility of red soil and purple soil under rainfall simulation experiments using universal soil loss equation(USLE).The results showed that the K values were 0.325 2 and 0.276 3 respectively for red and purple soil.Meanwhile,the K values were also calculated for red and purple soil using EPIC model,they were 0.313 8 and 0.266 8 respectively.Bases on the comparison of K values with two methods,the correction coefficient of EPIC model was obtained,the value was 1.04.