Abstract
In the paper, we built the Spatial Computable General Equilibrium (SCGE) model which is based on Geographic Information Systems (GIS), makes one mesh one region and incorporates the established physical evaluation model of water environment to economic evaluate the improvement measures of the water environment in the continuous point in a river. It confirmed that this model is able to apply as an economic evaluation method by calculating the cost and benefit and analyzing the impact on the social economy system caused by a water environment improvement measure in Yoshida River which is branch river of Nagara River.
