In this study, the variation of surface radiation and albedo over Semi-Arid area are analyzed by using the land-surface radiation data observed over Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) during April 2006 to April 2010. The variation of surface radiation over Arid area in spring were also analyzed and compared with the surface radiation over the SACOL by using the land-surface radiation data observed over Zhangye National Climatological Observatory during April 2008 to ...