Runoff and sediment data from hydrological stations provide the database for studying regional soil and water loss. Yet up scaling of these point data is needed to represent the regional area. Based on published hydrological data

runoff and sediment were calculated for evaluating units by dividing the study area into hydrological polygons

combining hydrological data with the hydrological polygons map

setting up the accumulative relationship between subcatchments and validating the runoff and sediment data. A national spatial hydrology database is built to assist spatial analysis. A preliminary application of the database is demonstrated by an example using data from 1955.