Abstract: Using measurements in micrometeorology and radiation balance in the surface layer in Mizuho Station,the diurnal and annual variation characteristics of radiation balance in spring,summer,autumn and winter are analyzed,and the momentum flux and the sensible heat flux in different seasons are calculated by the aerodynamic method and the profile gradient alternate method. The diurnal variation characters of the latent heat flux from the equation for energy balance are also obtained. The results from the calculation are compared. Finally, the relationship between the turbulent heat and momentum exchange coefficient and the diurnal variation of the Richardson number is discussed.