Abstarct: Western Dez plains, with an area around 757 km2, located on the west of Khuzestan, has been lengthen in north-south direction. It limited to Shirin-Abad anticline in the north, Sardar-Abad anticline in the south, Dez River in the east and Karkheh River in the west. This plain is completely covered with alluvial sediments which are loaded from Karkheh and Dez Rivers. The examined results of exploratory excavations represent piezometers as well as several artesian wells confirming that there are two unconfined and confined aquifers in the region. The average indicators such as annual temperature, precipitation and evapotranspiration are 24.2 C˚, 29.9 mm and 1500 mm, respectively, which shows a dry region. The hydraulic gradients of the underground water, followed by topography is mainly from northeast to southwest and also the middle part of plain where Shavur River is flowing. The maximum drop in underground water in northern part of plain was 4.12 m and the maximum water surface increase in the central part of plain was observed 1 m. Hydro chemical study baxsed on extensive examination of hydraulic conductivity and also 20 cases of anions and cations analysis, showed that an increase in underground water quality from north to south which is mainly related to region`s lithology which is mostly Bakhtiari conglomerate in northern part of the plain. In terms of potability, most water in the region ranges from good to medium and is drinkable. In terms of agriculture use, samples are often related to C2S1 and C3S1. Most of types of water samples are calcium bicarbonate and sodic calcic sulfates.