Abstract: The 1982-83 Ei-Nino/Southern OScillation event(ENSO) was one of the strongest of the century. In this paper the relationship between the tropical circulation in summer (June-August) in North-west Pacific and 1982-83 ENSO event has been anal-yased. It is shown that a weak subtropical high pressure,strong equatorial westerly at 850mb and strong equatorial easterly at 200mb over the Northwest Pacific and the acwalker circulation were established in equatorial ocean, and an active ITCZ was found over eastern ocean from the phillipines on the difference map of OLR (outgoing longwave radiation) for the summer of 1982 and 1983 (1982 minus 1983) during 1982 summer. On the other hand, large-scale summer circulation in 1983 was almost reversed from those of 1982 summer.It is thought that the aformentioned difference in Tropical circulation over Northwest Pacific in 1982 and 1983 summer results from the anomalously warm water in the eastern or central equatorial Pacific.