Abstract: Based on the observations on energy balance in winter wheat fields with different water treatments in Shunyi County，Bering，the daily and diurnal variations of energy partitioning，albedo and C0₂ fluxes over the different water treating fi elds are compared and analyzed．The results show that the daily mean albedo is about 0．18during the jointing period，the 1atent and sensible heat fluxes show significant diference under different water treatments．The daily variation of CO₂ flux above canopy is a parabola shape and the canopy is a sink of CO₂ in this period．