In this paper, the dynamic change of soil erosion in Ningxia Hui Autonomous Region is analyzed in detail from aspects of the types, areas, intensity, distribution, etc. of soil erosion by comparing the RS data of soil erosion in 1990 and 1999. The results show that the areas and the intensity of soil erosion in all the types in Ningxia Hui Autonomous Region are reduced to varying degrees. It is considered that, except the systematical errors from the different applied methods in these two general surveys, the reduction of soil erosion is mainly brought about by the soil and water conservation. Some measures are put forward for the further soil and water conservation in the future. It is suggested to regard the objectives of improving the ecological environment, reducing the silt content of the Yellow River, and increasing the farmers' income as the purposes of soil and water conservation. Concretely, it is suggested to regulate the land use structure, increase the dynamics of afforestation and grass planting, further implement the prevention and control of soil erosion and land desertification, and improve the ecological environment.