Abstract: Based on the survey, sampling and previous data, the SPSS and other software for groundwater pollution analysis are applied to study the regional geological conditions, spatial distribution characteristics of hydrochemical parameters, chemical types and chemical genesis of groundwater in Lianhuashan area, Changchun City, Jilin Province. The results are shown as follows:The groundwater is characterized by high hardness and high salinity; The average HCO₃^- concentration is dominated in the ions of groundwater; The mass concentration of total dissolved solids(TDS) is high with large difference between zones; The metasilicic acid and Sr contents in parts of Lianhuashan area meet the standard of mineral water, serving as the development potential area; The Na⁺ and K⁺ both come from the dissolution of rock salt and silicate rock; The Ca²⁺ and Mg²⁺ in shallow groundwater are mainly from the dissolution of carbonate; Cation exchange has occurred in the shallow groundwater.