Abstract: Based on the regional climate model version 3 (RegCM3) and emission inventory data from Streets in 2006, the indirect climatic effect module was inducted into the RegCM3. Cloud precipitation scheme was ameliorated. The temporal and spatial distributions of the sulfate aerosol and radiative forcing were simulated. The results indicate that the seasonal variation of radiative forcing of the sulfate aerosol is significant. For temperature, the direct climatic effect leads to the surface temperature decreased. The areas with large forcing appear in the Sichuan Basin in winter and spring and in the plains of the north China in summer, respectively. For precipitation, the direct climatic effect causes precipitation reduced along the belt of the water vapor transport across southwest to northeast. The indirect climate effect is to increase temperature in the south and decrease in north, while it decreases the precipitation in the Pearl River valley and the Yellow River valley and increases in the Yangtze River valley and the northeast China. In general, the direct climate effect is stronger than the indirect effect.

Key words: regional climate, sulfate aerosol, radiative forcing, climate response, Regional climate, Sulfate aerosol, Radiative forcing, Climate effect