Abstract: By using the explorational data of the high atmosphere at key area (155°E, 2°S) obtained from three dimensional measurements of international TOGA - COARE project investigated by R/V (Xiang Yang Hong No. 5) during the Intensive Observing Period (Nov. 1992－Feb.1993) before 1993 El Nino (in April) and ENI data provided by CAC of U. S. A, the vertical variations of wind field west of the ascending area of atmospheric convection in the western Pacific warm pool region is analysed. It is pointed out that there is a strong wind belt at the upper and low er parts of troposphere. With the development of air－sea anomalies during ENSO event, the strong easterlies and westerlies in the high and low atmosphere both presented reinforced trend,and sustained for 14 and 18 days and reached jet flow standard which accounts for 56% and 72% of the days of corresponding leg during the strongest period respectively.It is also suggested that the strength of strong wind belt has close relation to the variety ofstrength and altitude of temperature inversion in lower tropopause.