Abstarct: Population growth and lack of good quality water resources necessitate the need for quality and quantity investigations of groundwater resources in hard rocks. In this regard, the temporal and spatial changes of hydrogeochemical parameters and heavy mextals in groundwater resources of shir-kuh have been investigated in this study. Shir-kuh area located in the southwest of Yazd, is the main recharge zone of Yazd-Ardakan plain in Yazd province. According to the results, the mean electrical conductivity in groundwater resources of Shir-kuh is about 624 µs/cm, mean total dissolved solids (TDS) is about 442 mg/l, the average of pH is about 7.5 and average concentration of silica (SiO2) is 9 mg/l. These values are higher as compared with the average in granitic rocks, which is mainly due to the dissolution of sediments in fractures caused from sedimentary unit over shir-kuh granit as an unconformity. Water Types in most samples were Ca-HCO3 and electrical conductivity and silica increased by reducing the sampling height. The relative increase of hydrochemical parameters in 1394 as compared to the year 1381 is probably due to the rainfall reduction and increase temperatures in recent times. The concentration trend in heavy mextals is like Sr> Ba> Sn> W> Cu> U> Zn> Th. The Values are below standard drinking limits but concentration of uranium and thorium are higher than maximum contaminant level good of USEPA. Maximum concentrations of uranium were identified in the western part of the granitic rock that show a direct correlation with increased electrical conductivity, silica and thorium. The results of factor analysis and cluster methods indicate the two main factors of dissolution of fracture sediments (salts and calcite) and weathering of biotite as the sources of ions and heavy mextals in groundwater of shir-kuh.