Abstract: Based on the data of the solar radiation in 66 radiation stations and the data of the sunshine in 679 normal meteorological stations in China,the different estimation models for calculation of the direct solar radiation transmission rate,such as each month model for each station,each month model for all stations,each station model for all months,and a model for all months and stations,were established.The estimation method of the direct solar radiation transmission rate was studied.Based on the assessment of the errors of the calculation result of all the models,the each month model for all stations was chosen as the best model for calculation of the direct solar radiation transmission rate.The spatial distributing maps for the monthly direct solar radiation transmission rate for China at grid 1km×1km were made by using the GIS and Kring interpolation method.The spatial distributing of the direct solar radiation transmission rate and its main influencing factors were analyzed.

Key words: Direct solar radiation transmission rate, Direct solar radiation transmission rate, Estimate model, Kriging interpolation method