Abstract: In this paper,the distribution characteristics of hourly irradiance are analyzed in 13 radiation stations of Hebei province,the result of which shows that the greater proportion of irradiance above 875 W/m2,the higher of the solar energy resource. The SMARTS mode was used to calculate clear-sky global radiation,and a calculation equation on solar energy resource was established based on the percentage of sunshine. Compared with observed data,the absolute deviation is 0-341.43 MJ/m2,and the relative error is ranges from-6.66% to 7.41%. The calculation values during summer years are low while which during winter years are high. The monthly relative error approximately conforms to the normal distribution,positive error occurs 84 times and the negative occurs 72 times,48.7%relative error for monthly global irradiation is between ±5%. The absolute value of relative error is greater,the frequency is lower.