Khark Island groundwater was studied to identify the quantitative and qualitative potentials and limitations of groundwater resources. For this purpose, basic studies including meteorology and climate, hydrology, geology, geophysics, hydrogeology and hydrochemistry; determining the aquifer expansion and the status of the saline and fresh water boundary by using the 120 geoelectric soundage; quantitative and qualitative aquifer monitoring including water level and analysis of the main anions and cations, heavy metals, TPH, EC and temperature by sampling from 27 wells; performing 17 pumping tests to calculate the hydrodynamic parameters and 8 infiltration tests by the double cylinders method was done. The results showed that the thickness of the aquifer varies from 3 to 4 meters near the shore to a maximum of 16 meters and, annually about 349149 cubic meters of water is used for drinking and irrigation that 1934500 cubic meters of water is supplied from Kowsar dam for these purposes. Despite to the calculations of aquifer groundwater balance that show the amount of recharge is more than discharge, the results of geophysics, hydrogeology and hydrochemistry indicate the saline water intrusion in the aquifer except the native area where has a high sewage, so that the developing groundwater resources is possible only in the residential area. Therefore, it is concluded that the best place to excavate the Felman well is in the Khark municipality, where can be extracted up to 50 cubic meters of water from the well daily according to the balance calculations. On the other hand, the surface water storage system should be created because the amount of runoff from rainfall is twice the infiltration, and recommended quantitative and qualitative monitoring and discharge reduction to control the salinity intrusion