By using the eddy covariance system data of the winter wheat growth stage from October 2009 to June 2010 at agro-meteorological experimental station of Zhengzhou,the variations of heat and CO2 flux in winter wheat fields were analyzed.The results indicated that diurnal variations of net radiation,latent heat,sensible heat and soil heat flux showed a uni-peak model,and the maximum values appeared around noon in general.The seasonal variation characteristics of net radiation,sensible heat and soil heat flux w...