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Under the situation that frequency of flooding and landslide disaster due to short-period, high rainfall intensity is increasing, this study investigates mechanism of run-off and moisture infiltration into subsoil based on results of field monitoring in two sites comprising different geological condition, and analysis by one-stage tank model. The results made it clear that rainfall downpour are divided into run-off, infiltration and surface retention, and ratio of each component changes, depending on soil properties such as permeability and porosity.