Abstract: The relationship between the indexes of ENSO during 1951-2001 in the tropical Pacific and the Antarctic sea ice extents during 1973-1998 are analysed,and the relationship between the sea surface temperature in the Southern Ocean and in the Pacific during 1950-2001 and the Antarctic sea ice extents are studied.The result shows that the variations of the Antarctic sea ice extents especially in the Southeast Antarctica is closely related to the ENSO erents.This telecorrelation shows that the circulation process of ENSO is closely associated not only with ai-r sea interact ion in the tropical. Ocean but also with the variation of the Antarctic sea ice extent.If the extent of sea ice in Southeast Antarctic anomalous increases or decreases,after lagging a year's,the indexes of El Nino and La Nina will become weaker and stronger accordingly,however the indexes of Southern Oscillation will become stranger or weaker accordingly.Such correlation machanism is achieved by the ocean circulation that transports the anomalous sea temperature from south to north.The anomalous variation of the Antarctic sea ice extent has an influence on the warmer and cooler structure of Antarctic Circumpolar Current and on the longitudinal transportation of anomalous warmer and cooler water,which leads to the anomalous variation of upper ocean in the tropical and subtropical Pacific,playing an important promotive role in the happening of El Nino or La Nina.