Based on the statistical data of hydrochemical indexes of high-fluorine and high-arsenic groundwater in the study area,25 groups of data were selected to identify the hydrochemical impact factors on the fluorine and arsenic concentrations.The results showed that fluorine and arsenic concentrations are high in the alkaline environment with high HCO3-concentration,fluoride concentration increases with the increasing of Na/(Cl+ SO4)ratio,and TDS in high-fluorine and high-arsenic groundwater is also high,indica...