The regional climate model version 3 (RegCM 3) coupled with a chemistry-aerosol model was used to investigate the effect of three main kinds of anthropogenic aerosol(sulfate,black carbon and organic carbon) on regional climate in east Asia.The spatial and temporal distribution of aerosols and their influences on the radiative forcing,surface temperature,and rainfall during recent 20 years were analyzed.The simulation results show that the distribution of the aerosol concentration was different in winter and summer.The high concentration of aerosols was mainly located in south of east Asia in winter,and then it would expand northward.Short wave radiative forcing of the aerosols at both the top of the atmosphere and the ground was negative.Introducing three kinds of aerosol had significant effects on surface temperature in East Asia.The cooling center was located in Sichuan Basin in winter,whereas the greatest decrease in surface temperature was found in north China in summer.The direct climate effect of sulfate,black carbon and organic carbon aerosols leaded to a reduction of winter precipitation in most regions of east Asia.Summer rainfall in east Asia had a significant correlation with summer mean column burden of aerosols in southern China.The rain belt in eastern China would shift southward.