The relationship between soil susceptibility and the soil chemical characters were studied,and find out the mechanism of soil susceptibility variation with soil erosion intensity.The soil susceptibility increases with the soil erosion decreasing,and at the same time,the content of organic materials and magnetism mineral content are adding.In this study,we find the content of free ferric oxide is main reason of causing the soil susceptibility variation.The mechanism of soil susceptibility variation is that soil erosion make the soil redistribution in the slope,and the soil chemical characters changed too,at the same time and then the soil susceptibility changed too.