Kajan 1/100000 geological map is located in North East of Isfahan and is part of the central Iranian block. This area is covered by Cenozoic felsic-intermediate volcanic and basic-acidic intrusive rocks. The kalchue copper-gold index is located in South East of kajan map and includes two veins of coarse quartz associated with sulfide minerals such as pyrite-chalcopyrit -galena and sphalerit. Argillic and propylitic alteration in the vicinity Kalchue located at several points. In order to identify alteration zones associated with copper mineralization and also inquest the possibility of similar mineralization to Kalchue, in this study,remote sensing studies was done in around of Kalchue deposit. so after primary processing ASTER satellite imagery data alteration zones were identified using optimized Ls-Fit and band ratio and images false color composite method and Crosta method on ASTER satellite imagery data of South east of kajan. Wide siliceous alteration zone, phyllic and clay, containing a few amounts of iron oxides and pyrite and malachite.