Jinjiang watershed, located in the water eroded area of southeast coastal area of Fujian province, was used as an experiment zone. A remote sensing prediction model on the soil erosion suitable for watershed erosion area was established by using a great deal of data collected from soil and water conservation experiments, and prototype structure of USLE(A=fRKSLCP). A quantitative soil erosion remote sensing prediction system at county(city) level in red soil area in southern China was also established innovatively, realizing the quantitative, real time, and quick predicting on soil erosion. This prediction system was applied in an area of 11 000 km², and a spatial database system based pixels of 30m×30m and its renewable GIS system were established. According to the dynamic prediction made in 1988,1995, and 1996 in Nan'an city which is located in middle and down stream of the watershed. the result consistency comparing with the hydrologic method, runoff plot method, on spot investigation method, and file method reached more than 80%.