In this paper, the Wuqing Sag, a fourth-level tectonic unit where the water source in the north of Wuqing is located, was selected as the research area, and 95 groundwater sampling points were set up. Fluoride groundwater in the first aquifer was taken as the study object.Based on hydrogeological survey and sample analysis, the authors investigated spatial distribution of F- concentrations as well as evolution feature and genesis of fluoride groundwater in shallow aquifer from Wuqing Sag by means of hydrogeochemical plot, statistic analysis and geochemical modeling. The results show that the mass concentration of F- in shallow groundwater in the study area is generally high, the distribution trend is that the concentration in the NW-SE direction is the highest, and the concentration gradually decreases toward both sides, that hydrogeochemical types of groundwater with high F- concentration are relatively complex, and have the characteristics of weak alkali, high sodium and low calcium, and that the formation of high-fluorine water is mainly controlled by the strong evaporation and concentration, fluorite dissolution, calcite-dolomite precipitation, and F- desorption in this area.
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