Abstract: The Asia/Australia circulation anomalies in 1986--87 northern winter are featured by (1)prevalence of zonal flow over the NH mid-latitude, (2) location more to the north of the subtropical westerly jet, western Pacific subtropical-high ridge line and ITCZ, (3) frequent activities of the western North Pacific. cyclones, (4) prevalence of westerly and southerly flows anomalies over the Equator area and (5) higher pressure at Australian sea level.Consequently, winter monsoon weakens in East Asia, cold air diverts eastward in North China and temperature rises, resulting in excessive rain there but less-than-usual rain in the south. There is associated weaker summer monsoon in Australia, established a month later than usual, with the whole continent receiving deficient rain.circulation anomalies occur firstly in the low latitudes for ITCZ moves a month earlier than other systems towards the NH. From the summer of 1986, western Pacific SST remained higher near and to the north of the Equator, leading to the movement of ITCZ,which in turn made the Walker Circulation weaken and the SO index lower, favourable for the 1986-87 ENSO.The western Pacific SST anomaly mal be attributed to the abnormal north wind on 950-hPa for the summer-fall of 1986, and abnormal south wind for the winter, for 30N of the western North Pacific. So, sea-air interaction accounts for the Asia/Australia event.