This paper used the technology of RS and GIS as the main means to conduct the risk assessment of water and soil loss status of Weihe River basin in Shaanxi Province. It collected three factors that play a key role in soil and water loss through the method of sensing and spatial analysis, such as vegetation, slope and rainfall. The researchers dealed with the three factors using spatial superposition analysis of GIS, and the researchers also worked out the risk degree figure of soil and water loss in compliance with the classification of soil erosion grading standards (SL190-2007) and the soil and water conservation technology norms. Through the observation of data of remote sensing in 2001, it has been found that the water and soil loss status in Weihe River basin is more serious, especially in Luochuan, Qianyang and other regions.