Complementary relationships between the East Asian summer monsoon and the Australian winter monsoon have a significant impact on the climate anomalies in the Northern and Southern Hemispheres.Using the National Centers for Environmental Prediction/National Center for Atmospheric Research(NCEP/NCAR) reanalysis data,the Hadley Centre Global Sea Surface Temperature dataset,and the CPC Merged Analysis of Precipitation (CMAP) data,based on the joint index of East Asian-Australian monsoon,this paper investigated the reverse variation characteristics of the East Asian summer monsoon and Australian winter monsoon intensities.Results show that when the East Asian summer monsoon is stronger and the Australian winter monsoon is weaker,complex anomalous circulation systems appear in the middle and low latitudes of the Northern and Southern Hemispheres.In the lower troposphere of the tropical region,the anomalous anticyclonic circulation system in the northwestern Pacific is intensified,which is coupled with the anomalous anticyclonic circulation in the South Pacific Convergence Zone(SPCZ),forming an anomalous easterlies near the equator,while there are two anomalous cyclonic circulation systems in the northern and southern Indian Ocean.In the marine continental area between the two pairs of anomalous circulations,the anticyclonic circulation is located in the south of the equator and the cyclonic circulation in the north of the equator.In the East Asian monsoon region,there is an anticyclone anomaly on the east side of the southeast coast of China,and southeastern China is affected by the southeast wind on the southwest side of the anomalous anticyclone.In addition,the northern Australia is affected by the anomalous westerly wind.As a result,the East Asian summer monsoon is stronger and the Australian winter monsoon is weaker,which leads to a complementary relationship between them.When the East Asian summer monsoon is weaker and the Australian winter monsoon is stronger,the circulation characteristics of the Northern and Southern Hemispheres are opposite to the above.On the whole,when the East Asian summer monsoon is stronger and the Australian winter monsoon is weaker,different climate anomaly distribution characteristics appear in the Northern and Southern Hemispheres of the East Asian-Australian monsoon area,that is,the precipitation is less in the north(east) but more in the south(west) and the temperature is higher in the north(west) and lower in the south(east) in the Northern(Southern) Hemisphere.