Water and soil conservation monitoring is the foundation to protect water and soil resources, maintain ecology environment and control water and soil loss. Based on the current research and application status of 3S technology（GIS:geographic information system; RS: remote sensing technology; GPS: global positioning system）in the monitoring of water and soil loss, taking the dynamic monitoring of water and soil loss in Anyuan district, Pingxiang city as an example, this paper expounds the application ideas and development prospects of 3S technology in the dynamic monitoring of water and soil loss. 3S technology has efficient data acquisition and analysis capability, which makes up for the shortcomings of traditional monitoring methods, and can provide effective theoretical and technical support for dynamic monitoring of water and soil loss.