Through the use of the hourly wind, air temperature and humidity, sea surface temperature datameasured on board the observing vessel Moana Wave and buoy in the warm pool of western Pacific during thelOP of TOGA COARE, we compute the fluxes over sea surface and analyze the characteristics of the variation ofthe latent heat flux with sea surface temperature. During weak rather than strong wind periods a maximum valueof latent heat flux appears at some points of SST, which is caused mainly by the variations of wind, then by thehumidity difference between air and sea and the transfer coefficient with SAT. Using correlation analysis. we alsoanalyze the relationship between the fluxes and meteorological elements during weak wind periods. westerlywind burst periods, and convective disturbed periods etc. The main conclusions are that the latent heat flux ismainly determined by wind, sensible heat flux by the potential temperature difference between air and sea andthe momentum flux by wind. The precipitation affects the sensible heat flux through the potential temperatureditTerence and wind. Through the use of the hourly wind, air temperature and humidity, sea surface temperature datameasured on board the observing vessel Moana Wave and buoy in the warm pool of western Pacific during thelOP of TOGA COARE, we compute the fluxes over sea surface and analyze the characteristics of the variation of the latent heat flux with sea surface temperature. During weak rather than strong wind periods a maximum value of latent heat flux appears at some points of SST, which is caused by mainly variations of wind and then by the saturation difference between air and sea and the transfer coefficient with SAT. we alsoanalyze the relationship between the fluxes and meteorological elements during weak wind periods. westerlywind burst periods, and convective disturbed periods etc. The main conclusions are that the latent heat flux is primarily determined by wind, sensible heat flux by the potential temperature difference between air and sea and the momentum flux by wind. T he precipitation affects the sensible heat flux through the potential temperatureditTerence and wind.