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Direct Solar Radiation (DSR) is one of the most crucial weights of Solar Radiation, and its quantity calculation is very complex due to the influences of local topographical factors and terrain inter-shielding. DEM data as a representation of the complex terrain and multiplicity condition produces a series of topographic factors such as slope and aspect, etc. Based on DEM data and meteorological observations, a distributed model for calculating DSR over rugged terrains is developed for Yangtze Rive Basin. Using the distributed model, this paper comes true fix quantify simulation of space distributing and space visualization, and deeply analyzes variation disciplinarian of DSR due to locality and terrain. The results suggest that the direct solar radiation quantity over mountainous area for Yangtze Rive Basin influenced by local topographic factors has a clear spatial difference and annual DSR quantity of sunny slope (or southern slope) of mountains is obviously larger than shady slope (or northern slope).