Solar energy is one of the free, accessible, measurable and without pollution sources that can be easily utilized in different areas. In this research amount of cloud cover, sunny hours, during the period of 30, 20 and 10 years for 51, 146 and 218 stations and lighting hours for 403 station were estimated annually and monthly and were mapped in GIS software. The results of the studies show that maximum of cloud cover and minimum of sunny hours are temporally and in winter and autumn and in the northern half of Iran. In addition, the minimum of cloud cover and maximum of sunny hours are found in the southeastern and south half of the country. Most potential utilization of solar energy in summer and spring, there are in the plains of southeast, eastern, central and southwestern in Iran. It could be concluded that temporal and spatial changes of the three above mentioned parameters have direct relation with the Iran climate system and the position of sun in the sky.