In order to find out the chemical characteristics of groundwater and groundwater quality in Qapqal County area, 50 groups of groundwater samples were selected in 2016, and the chemical characteristics of groundwater and groundwater quality in Qapqal County area were studied by means of comprehensive statistical analysis method and Hydrochemical method and fuzzy comprehensive evaluation method. The results showed that the content of Mg²⁺, Ca²⁺ and HCO3^-ions in groundwater in Qapqal County area was high. The PH value of groundwater sample is 7.55-7.7, the mean value is 7.63, the whole groundwater is weak alkaline, the TDS value is 103.8-1139mg/L, the mean is 254.8mg/L, and the groundwater hydrochemical type is HCO3-Ca(Ca?Mg) and HCO3?SO4(SO4?HCO3)-Ca(Ca?Mg) is mainly water-based. The hydrochemical characteristics of groundwater are mainly controlled by the action of water rock, and a few shallow buried areas are affected by evaporation, which is almost unaffected by atmospheric precipitation, and the evaluation and analysis of groundwater quality in the county area by F value method and fuzzy comprehensive evaluation method know that the groundwater in this area is less polluted, but there are also serious polluted areas, In the use of water resources at the same time also pay attention to the protection of water resources.