Abstract: As a general,water-saving irrigation includes the development and utilization of water resources,the agricultural water-saving techniques and the water-saving irrigation techniques,etc..Those measures can change some soil erosion factors and take action to the soil and water conservation.Based on the studying of different water-saving measures,we got conclusions that water-saving irrigation can protect and improve and rational use the water and soil resources in mountain and hilly area,change the tiny landform in flopping filed,increase the ground roughness and the plant coverage,impound the precipitation and slowing the surface runoff,improve the soil structure,increasing the soil anti-erodibility,infiltration and water-saving capabilities etc.