Abstract: Based on the observation data of field insolation at the Manxi First Well of Takelamagan Desert from June to August，1988，the initial analysis was made on the short-wave radiation of the sun in this area.It pointed out that because the heating effect is strong in desert area during the summer and there used to be windy and dusty weather，the atmospheric aliasing degree is often over 6.0 ..Dust is the main cause of lower transparency. Scattering radiation flux is one-second as much as the total radiation flux and reduces the di- rect solar radiation greatly.The direct radiation in the middle of Tarim Basin is in low volue， and the totle radiation is weak and in low value too .The daily mean reflectance of each month is between 22-35% in summer，and the monthly average value is 30% .