The analysis of severe thunderstorms is made based on th e observation data from 1961 to 2000 in the eastern Hexi Area. The temporal and spatial distri bution of severe thunderstorms in the eastern Hexi area is discussed. The result s show that there are four weather patterns and four weather conditions favorabl e to severe thunderstorms, which can be used as essentials for forecasting sever e thunderstorms in the eastern Hexi area.