To arrange migration froin the,ubmergible region in the Three Gorge Reservoir to themountains,it is possible to bring about changes in water and soil conditions of terrain surfacein the reservoir region.The storm is the most important dynamic factor causing erosion. The paper analysed temporal distribution of the annual precipitation in the Ziqui region,and discovered very strong variation characters in the temporal and spatial distribution ofstorms,At the same time the paper described relevant hydrological factors,such as evapo-transpiration,moisture of the soil,etc.Then the stormrunoff process in the Wangjia Bridge catchment was simulated.