Interaction between El Niño of the tropical Pacific and Indian Ocean Dipole was studied on the basis of the monthly NCEP/NCAR reanalysis dataset and GISST data.There was an obvious jump in this interaction relationship between Dipole and ENSO events before and after 1961.The analysis results based on the CCM3(community climate model version 3) model are summarized as follows:the interaction of El Nio upon Indian Ocean Dipole mode was very weak during the phase between 1930 and 1961.But from 1962 to 2001,Indian Ocean Dipole mode provided favorable conditions for Pacific warm events.The Walker circulation over the tropical Pacific and the vertical zonal monsoon circulation over the tropical Indian Ocean coupled well over the oceanic continent.The warm events over the Pacific also provided favorable conditions for Indian Ocean Dipole mode from 1962 to 2001.