Emphasis is laid on the stability of the initial data and empirical coefficients for calculating the global solar radiation (GSR) in this paper. Using the GSR from clearskies as the initial data for calculating the GSR is an effective method if it can be computed in advance. The formula for computing the GSR under actual weather conditions isremade on the basis of the work completed by the authors and the results are comparedwith others. Meanwhile,both the stability of the empirical coefficients in different kindsof formulas and the sensitivity of these coefficients to the GSR are examined. Resultsshow that the formula used in this paper has high accuracy,stable coefficients and lowsensitivity compared with others. The geographical distribution of the coefficients is analyzed and the coefficients at the nonactinological stations are worked out via interpolation. As a result, the GSR over China is computed.