Energy balance in the terrestrial ecosystem plays an important role in regional climate and water balance. In this study,the characteristics of surface energy balance were researched using the ordinary least square ( OLS) method and energy balance ratio ( EBR) method based on the surface flux data observed at Xiaotang landatmospheric interation observation station in the northern marginal zone of the Taklimakan Desert during the period from July to December 2014. The results showed that,except for the latent heat flux,the daily variation curves of other energy flux components were invertedU-shapedand unimodal,which were characterized by seasonal variation and in an order of summer > autumn > winter. The energy balance was in an order of whole day > daytime > night and in a degressive trend. The energy closure degree of 5 cm deep soil heat flux was significantly higher than that of topsoil heat flux. The energy closure ratio fluctuated sharply at the sunrise and sunset,it was negative at night,and apparently higher in the afternoon than in the morning. Under the different weather conditions,the energy closure ratio was in an order of sunshine day > cloudy day > sandstorm day > rainfall day.