Groundwater chemical characteristics and water quality are affected by both natural geological conditions and human activities. Taking the Dawen River Basin as the research object, we analyzed the hydrochemical characteristics and their influencing factors through field investigation and sampling, evaluated the water quality by applying the entropy-weighted water quality index （EWQI）, distinguished the degree of influence of human activities on the groundwater quality by applying the method of identifying hydrochemical anomalies, and then coupled the two evaluating methods to identify the types of groundwater water quality. The results showed that the anions and cations of groundwater in the Dawen River Basin were dominated by HCO