Influences of the Indian Ocean Dipole(IOD)on the intensity of ISO(30-60d,hereafter)have been studied in the present article,by using the NECP/NCAR Reanalysis and monthly GISST SST data from 1979 to 1998.The results demonstrate that the IOD has significant influences on the intensity of ISO in Africa.The effects of IOD on the intensity of ISO in Asia are also significant.The variations of the zonal wind(U),geopotential height(H)and meridional wind(V)on intraseasonal timescale at 200hPa are modulated by the IOD.There are distinctly different or even opposite,in some areas,impacts of IOD and ENSO on ISO intensity.A further analysis on the anomalous distributions of the intensity of U,V ISO at 200 hPa in 1994 are also presented to display the propagation features of ISO phase and the Rossby wave energy.