Abstract: Based on the NCEP wind filed data of 1995～2013， the seasonal and interannual variation of the dipole wind stress curl pattern in the southwest seas of Taiwan Island and its effects by ENSO events were analyzed. It is found that the variation of dipole wind stress curl pattern in the southwest seas of Taiwan Island is notably seasonal， which mainly occurs from October to April. However， there is no dipole wind stress curl pattern in summer. The dipole wind stress curl pattern lags 1 month behind ENSO. The dipole wind stress curl pattern in the El Nino year is much weaker than that in the normal year. However， when La Nina occurs， the dipole wind stress curl pattern is much more intense. There is a quasi16.0month and aquasi45.3month cycle in the variation of the dipole wind stress curl pattern， which is closely related to the ENSO circulation．