Abstract: In order to calculate the daily global solar radiation in the vast non-observation area,it is necessary to establish a calculation model for the daily global solar radiation according to data obtained in radiation areas.Based on the research in the domestic solar radiation observation and the calculation methods on the global solar radiation,a new calculation model was designed by using factors,such as the sunshine percentage,the precipitation and the atmosphere potential precipitation,daily range of temperature etc.,to calculate the daily global solar radiation.Taken Wuhan,Yichang and Zhengzhou as examples,the non-capping and creditable data of global solar radiation in 2005 was used to build a set of sample sequence.Furthermore,model parameters under the condition in sunshine or in non-sunshine were separately calculated according to least squares method.Finally,the calculation consequences were verified by the data of 2005 and period from January to August in 2006.The results showed that the mutuality between the model calculated sequence and the actual value sequence was highly significant.The mean absolute error in the verification was with 1.31MJ m-2 d-1 and the relative error was with 9.5%,which were smaller than results obtained by the domestic research.In conclusion,the model can be used to calculate the daily global solar radiation in the non-observation area.

Key words: Daily global solar radiation, Daily global solar radiation, Estimation, Calculation model