Process of Change in the Geographic Information System Technology In IRAN’s Geology and Exploration The geologist or explorer, linking different geological data , will seek for useful geological structure in an area. All geological data, in order to be fruitful and productive, should be interpreted considering their geographic locality. Geographic Information System, Providing presentation facilities and simutanous data interpretation, enables the geologist or explorer to prepare mineral potential maps with various data more quickly and precisely, which was impossible to be carried out with analogue and traditioal methods. Geographic Information System is used for making decision for those Geological Survey of Iran’s Projects which are based on spatial data. Cartographic application of GIS in collecting , digitalizing and preparing different scale geological maps and in national scale (geological, air borne geophysic, mineral , geomorphology maps and etc.) are among the main application of GIS for the numerous geoscientists. (Figs : 1 , 2)  Figure 1 Geomorphological map of Iran  Figure 2 Metalogenic map of Iran |