The main achievements on soil erosion studies of ridge-hill-gully slope system in loess plateau are out lined. Based on the trends of studies in this field mentioned above,it is suggested that dynamic analysis should be taken as the key link, experimental simulation as the basic methed,time-space relationship between erosional forms, material and energy as the characteristics,thus bringing to light physical genesis of soil erosion in ridge-hill-gully slope system and providing scientific basis for soil and water conservation practice.