The correlations of the wind stress anomalies over tropical Pacific and the SSTA in the Nino3 region shows that the Nino3 SSTA is well correlated with the leading wind stress anomalies,which occurs-when the wind stress is prior to the Nino3 SSTA by eight months.The location of wind stress in all strong correlation areas expands toward the middle Pacific in pace with shortening the leading time.The result obtained by investigating the effect of the wind stress in different regions on SST in the tropical Pacific by means of numerical method,shows that there is obvious influence of the wind stress in higher correlation regions on developing and sustaining the climatological monthly mean fields of SST in tropical Pacific,but it contributes significantly to the interannual variability of SST;instead,the wind stress outside the higher correlation regions exerts an important influence on developing and sustaining the mean fields of SST,but does a little on the interannual variability of SST.