Abstract: Based on the meteorological data collected from the offshore platform from November 26, 2017 to May 31, 2018, the momentum flux, sensible heat flux, latent heat flux and evaporation duct height were calculated using coupled ocean-atmosphere response experiment algorithm in sea air boundary layer in which the universal functions developed under the stable condition were introduced. And the correlation between air sea interface flux and evaporation duct height was analyzed. The results show that the momentum flux is in the range of -0.5—0 N/m², the sensible heat flux is in the range of -10—5 W/m², the latent heat flux is in the range of 0—300 W/m², and the evaporation duct height is in the range of 0—25 m. For all the observed data, the correlation coefficient between the evaporation duct height and latent heat flux is 0.77, that between the evaporation duct height and momentum flux is -0.23, and that between the evaporation duct height and sensible heat flux is -0.05. The correlation coefficient between evaporation duct height and latent heat flux is 0.73 under stable condition, 0.93 under neutral condition and 0.95 under unstable condition. These results provide a support for revealing the formation mechanism of evaporation duct under different atmospheric conditions.