Water and soil loss is an important landforms evolution course.Based on the theory of landforms erosion circulation and DEM analysis used as the method in the research of valley landforms evolution,the period of landforms evolution of massif region in Yishusi Valley is divided into youth period and old period.The correlation of soil erosion potential danger and soil erosion intensity comprehensive index and landforms evolution period implies that both human activity and landforms evolution period are of importance in soil erosion.