Fifteen (15) water samples were collected for chemical analyses and hydrochemical facies, from water wells distributed throughout the study area, the analyses have been done at Water and Environmental Sanitation Project laboratory (WES) at Al Fashir town. All water samples were analyzed, according to standard methods for water examination by Photometer 7100. Strater Demo-4 used for great geological cross-sections, SPSS software for statistical basic analyses (minimum, maximum, mean and standard deviation), Aquichem software used for delineate hydrochemical facies GIS technique was used to construct water sample location sites. The interaction between water and rocks, are changed the original chemical composition of groundwater in the area are mainly carbonate dissolution, which affect Ca2+ and HCO3- and reverse ion exchange reactions with clay minerals that affect Ca2+, Mg2+ and Na+. Based on Stiff Diagram the dominant water type is Ca2+ - Mg2+ - Na+ - HCO3-facies.According to results of chemical analysis and recommended values given by (WHO, 2011) and (SSMO, 2009), the groundwater in the area is excellent and good for domestics uses.