By using the land-atmosphere interaction measured data observed over Dingxi Arid Meteorology and Ecological Environment Experimental Station during December 2003 to February 2004, the characteristics of the daily variations of the surface radiation budget,energy balance, and soil temperature under different types of synoptic conditions (including a clear day,a cloud day and a snow day ) and averaged conditions are analysed.The comparison of micrometeorological characteristics under the three types of synoptic conditions shows that there is much different among features of radiation and energy budget under different synoptic conditions, the characteristics of the averaged daily variation in winter is very close to ones under the condition of a clear day because the influence of cloud and snow are limited. In winter, the sensible heat flux plays a leading role,and the soil heat flux depends on it. However, there is an large imbalance in surface flux measurement. The daily value of net radiaton and soil heat flux is negative in 2/3 times after winter comes, and it becomes positive in the rest time, so the surface heating field is heat source in winter.The diurnal variation of the soil temperature is just in the upper 20cm layer soil. The soil temperature below 30cm has very litter diurnal variation. The diurnal average of surface albedo is varied between 0.20 and 0.25, and the mean of diurnal surface albedo is 0.22. 