The TOPMODEL is a physically based variable contributing area model of basin hydrology. It has two distinct advantages to be applied in developing areas with little hydrological observations. One is that it has both advantages of lumped model and distributed model, i. e., few parameters to be identified and the capability of simulating the impacts of land use changes and water resource system developments. The other is that the soil topographic index that the model greatly depends on may be easily identified through satellite information. In this paper, a distributed hydrological forecasting model by combining the block-wise application of the TOPMODEL with the Muskingum-Cunge flood routing method is proposed. The model is applied to the daily and hourly runoff simulation for the 3500km² Fujikawa basin in Japan and to the daily simulation for the 19000 km² sub-basin of Minjiang catchment in China. The results presented are encouraging to suggest that the proposed model is hopeful to be reasonably applied to large basins with DEM and other GIS oriented data.