The 3S technology,an integrated technology with remote sensing,GPS and GIS,is a new high-tech means.The 3S technology was used for the investigation of soil erosion in Xiamen,and the studying method may be outlined as follows.First,the author obtained the slope data by DEM,the vegetation cover rate by interpretation of SPOT5 images,and the land use data by the digital land use map.Second,the author understood the situation of soil erosion by following the standards for soil erosion classification and gradation and using the overlaying function of GIS.Third,basing on the situation of soil erosion in the region,the author analyzed the changes and causes of soil erosion distribution.The result provides a scientific base for soil and water conservation planning and soil erosion control.