Abstarct: The basic objective of this study is evaluating the development of karst and assessing quantitative and qualitative of water resources in Ahangaran limestone mountains. The study area is located in Zirkouh county at 150 kilometers distance northeast of Birjand in South-Khorasan Provience. According to the geological division, the area is located in northeast border of East Iranian Flyshes Basin and is a part of the Afghan Block. As the result of faults and folds with northwest- southeast trend was uplifted and introduced Uplift Ahangaran Block. Lower Cretaceous and Paleocene limestone rocks are major rock units with an approximate area of 500 square kilometers which are important because of formation of karst aquifers. According to the geomorphological survey, The karst features including karrens, solutional cavities, dry valleys and a few caves in the study area were distinguished, but the more important karst features such as sinkholes, closed depressions and poljes were not observed, which indicate relatively low degree of karst development. The large number of seasonal springs with low discharge prove the low degree of karst development in the region. Study of important springs and spring-qanats including Abiz, Mohammadabad, Tejnood, Ardekul, Hemmatabad, Esfad, Fandokht in 1393-1394 showed that the dominant difuse flow system, because their discharge coefficient variation are less than 10% and coefficient variation values of electrical conductivity are less than 5%. The discharge coefficients in these springs fall in range of 10-3 and 10-4. The concentrations of main anions and cations indicate water types of bicarbonate-calcium, magnesium. baxsed on hydrogeology conditions, geological and morphological setting, catchment of important springs and spring-qanats identified and percentage of recharge evaluated between 40 to 60 percent witch is the relatively high percentage of recharge in the region.