In the present paper a solar mapping methodology is presented. The work was carried out for the major part of Algeria; a sample of data covering 50 sites over the whole country was considered. However, due to the lack of radiometric data which are essential for this study, data obtained from simulation were used. Kriging method was chosen in order to perform different interpolations trough Surfer ® software, it will allow us to prepare the Grid file necessary to get to the last step which is the establishment of solar map for the whole Algerian country.