The ISO9845-1-1992(E) standard has been issued for more than 20 years, the various factors that affect the solar spectral radiation have been undergone many changes over the years. The standard data cannot satisfy the current needs. According to the opinions of international experts on the revision of ISO9845-1-1992(E): in the revised standard, the spectral irradiation of different inclined surface should be added, Accordingly, China land center and European land average latitude should be calculated. In this paper, the geometric average latitude and weighted average latitude of China land are calculated respectively. The direct normal irradiance and hemispherical irradiance are calculated by using SMART model at the two tilt angle that corresponding to the latitudes.