The information on solar radiation, especially atmospheric factors and sky condition's quantitative influence on solar radiation is very important for radiation budget in the Qinghai-Xizang Plateau(QXP) as well as for weather and climate in East Asia, while such observation and detailed analysis is few until now. Nam Co and Yangbajain locate in the center of QXP, the difference between total solar radiation at Yangbajain and Nam Co is of great significance to regional characteristics of shortwave in the hinterland of QXP. Using the one-year observed data of total solar radiation of highly temporal resolution and NCEP/DOE reanalysis data, the characteristics and variation of total solar radiation, and factor influencing the solar radiation by shortwave flux transmittance are analyzed. The results show that the shortwave flux transmittance at Yangbajain and Nam Co stations are very high, about 0.807 and 0.817 in completely cloudless sky, its volatility is very low and derives from different altitudes and latitudes. At the same time, the cloud can lessen the disparity of shortwave radiation at two stations, the annual mean flux transmittance is about 0.674 at Yangbajain station, while 0.675 at Nam Co station. What′s more, cloud can make dramatic fluctuations to flux transmittance over time. In addition, comparing with the ground-based data, in completely cloudless sky, the total solar radiation from NCEP is favorable despite the small error that is about 5.74% at Yangbajain station and 8\^49% at Nam Co station. However, in cloudy day, the relationship between NCEP and observed values becomes much discrete, and NCEP radiation has a much systematic larger deviation. Therefore caution needs to be exercised when using NCEP data to analyse solar radiation over the QXP.
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