This paper is the result of hydrogeological and environ mental survey engineering.[Objective] In order to find out the characteristics and evolution of groundwater in Changchun new area and support the construction of northeast old industrial base.[Methods]Based on the investigation and sampling, this paper makes full use of the previous achievements and data, and applies SPSS analysis software and groundwater pollution analysis software, through the analysis of the geological conditions, the spatial distribution characteristics of hydrochemical parameters, the chemical types of groundwater and the chemical causes of groundwater in Changchun new area, a series of results are obtained.[Results]The groundwater in Changchun new area has high hardness and mineralization, HCO₃^－ is dominant in the ions of groundwater, and the absolute mass concentration of Ca²⁺、Cl^-、O₄^2-、Na⁺ is relatively high; the mass concentration of pH,H₂SiO₃、Sr,TDS,Mg₂₊,HCO₃ is relatively stable; the ions of groundwater are mainly HCO₃^－ and Ca²⁺; Na⁺ and K+ are from the dissolution of rock salt and siliceous rock; Ca²⁺ and Mg²⁺ are mainly from carbonate dissolution of salt.The quality of groundwater in the area can be divided into four grades, among which class V water is not evaluated.[Conclusions] In general, class I water accounts for 7.50%, class II water 32.10%, class III water 20.80%, class IV water 39.60%. More than 60.4% of the groundwater is in good condition.
Highlights: The chemistry, origin and evolution of groundwater in national new areas are studied, and the water quality characteristics of groundwater are obtained, which can effectively support the healthy development of regional ecology.