Abstract: Chemical properties and pollution of water resources were studied in the MengXu town basin that is located in the Guiping city, Guangxi Autonomous Region of the Zhuangs, Southern China. Water quality was characterized according to its major constituents and the geological features of the area. Chemical analysis results indicate that groundwater show wide concentration ranges in major inorganic ions, reflecting complex hydro chemical processes. Groundwater in the studied area is, for the most part, weakly to moderately mineralized and dominated by the calcium (Ca²⁺) and bicarbonate (HCO₃^-) ions. Within the basin, 2 main different hydro geochemical facies out of 7 have been identified: Ca-HCO₃-SO₄ and Ca-HCO₃. The predominant water type of groundwater samples is the Ca-HCO₃ facies in the recharge area and has a tendency toward Mg-HCO₃ and Ca-SO₄ facies along the direction of water flow. The results explained the importance of cation exchange, mineral weathering and anthropogenic activities on groundwater chemistry. Chemical analysis of the groundwater shows that the mean concentration of the cations is of the order Ca²⁺>Na⁺>Mg²⁺>K⁺, while that for anions is HCO₃^->SO₄^2->Cl>NO₃^-. Statistical analyses indicate positive correlation between the most of pairs of parameters. The dissolution of halite, calcite, dolomite and gypsum explains part of the contained Na+, Ca²⁺, Mg²⁺, Cl^-, SO₄^2- and HCO₃^-, but other processes, such as cation exchange and weathering of aluminosilicates also contribute to the water composition. A comparison of groundwater quality in relation to drinking water quality standards proves that most of the water samples are suitable for drinking water purpose whereas groundwater in some areas of the district has low salinity and low Sodium Adsorption Ratio (SAR), indicating suitability for irrigation water.