Abstract: The atmospheric deposition has great influence on the terrestrial and aquatic ecosystem. Since China has a large comsumption of coal and petroleum energy, the acid deposition of nitrogen and sulfur compounds deserves attention. Studying the amount and space-time variation of atmospheric deposition on various ecosystem could be a useful tool to estimate the maximum loads, so as to instruct the industry distribution. In this study, the deposition on different ecosystems (urban, forest, grass, wetland, farmland, freshwater and sea) in the Yangtze Delta Region has been studied by numerical modeling and field measurements. The meteorological conditions and pollutants concentrations have been simulated by the mesoscale meteorological model WRF and chemical transport model CMAQ. Through the modification of land-use data in meterological model, the modeled results have been imporved for meterological parameters, of which surface temperature and wind speed are the two with the most improvements. The improved description of meterological conditions also results in better description of pollutants concentrations. These set up a good foundation for the modeling of atmospheric depostition. The modeling difference of wind speed from original land-use data and modified data ranges from -2~1.5 m/s, and the difference of surface temperature ranges from -4~4℃. The modeling difference of NOx，NO3-、SO42- and SO2 concentrations ranges from -1000~1000, -20~20, -10~10, -500~500 n mol/m3.