Abstract:

With the rapid development of society and economy, soil and water loss gradually become the main ecological environment problems in China, the development of which is tremendously affected by the conditions of the regional land cover changes. In order to understand the rule of soil erosion, determine the ways of prevention and set up important methods and goals, “3s” technique was applied to dynamic monitor land cover and soil erosion changes, which is able to timely and accurately grasp the soil erosion situation. The middle route of SouthtoNorth Water Diversion Project is the important part of a largescale interbasin water diversion project  in China. With the gradual implementation of the water diversion project, the watershed area is increasingly widespread concerned in the community, and its strategic position and ecological niches draw more special and important attentions. Therefore, the objective understanding of soil erosion status in the entire study area and mastering the implementation of the measures in watershed area can provide a scientific basis for policy research to protect water quality and ecological environment of the watershed area.The ecological environment condition on watershed of the middle route of SouthtoNorth Water Diversion Project directly concerns the water quality. This study analysed the changes of land cover，soil erosion, etc., using remote sensing monitoring technology in the range of the whole watershed area to evaluate the ecological environment condition from a macro scale point, according to the land cover results of 2000 and 2013. This research shows that during over ten years，not only the rate of forest has improved but also the rate of farmland has obviously decreased. Moreover, the area of soil erosion has gradually reduced，and the ecological environment condition of the watershed tend to be better. As the rural population concentrating in the area along the river strip，it is suggested that more attention should be paid on ecological environment protection along the river strip and further plant protection around the hills and mountains. Monitoring results showed good posture tends of the overall ecological environment in the Southtonorth water diversion project area from 2000 to 2013.