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The sulfate aerosol direct effect on the onset, development and retreat of the East Asian subtropical monsoon is investigated by using an interactive global climate-chemistry model version 5 of the Community Atmosphere Model(CAM5) combined with NCEP/NCAR reanalysis dataset.The results of simulation suggest that the surface temperature in most parts of East Asian land is decreased, and the zonal thermal difference between East Asian mid-latitude land and western Pacific is weaken.