Based on the real-time observational data from 61 solar radiationstations, a method for climatological calculation of scattering radiationis discussed herein. Through detailed analysis of the effects of cloud-iness on scattering radiation, a semi-theoretical and semi-empiricalclimatological-statistical equation of scattering radiation is proposed,and using cloudiness data from 206 weather stations the scatteringradiation distribution over China is calculated and analyzed.