During Nov.1998～Oct. 1999 period ,airborne SO2 and SO2-4 conc entration were measured and rain water was collected on farmland at Yingtan,a ty pical red soil area of Jiangxi province.Based on hourly meteorological data,dry deposition velocities of SO2 and SO2-4 were calculated using a resistance model.Annual sulfur dry and wet deposition to the farmland ecosystem was estimated.Investigations show that the averaged dry deposition velocities of SO2 and SO2-4 on farmland are 0.373±0.170 cm·s-1 (mont hly averaged 0.161～0.545 cm·s-1) and 0.198±0.123 cm·s-1(monthly average 0.152～0.269 cm·s-1),respectively.The total annual sulfur deposit ion on farmland is about 10.3 g·m-2.Dry deposition is dominated in total deposition,accounting for 83.3 %.Further analyses show that SO2 dry deposition is prevailing in the total S dry deposition,accounting for 92.2 %.Atmospheric dep osition accounts for more than 90 % in sulfur input to farmland ecosystem,suggest ing that it plays an important role in sulfur cycle in farmland ecosystem.