Abstract: For investigating hydrochemical evolution and recharge characterisitcs of the groundwater in Funing County, northern Jiangsu Province, the study collected various water samples from regional surface water, phreatic water and confined water (the Ⅱ, Ⅲ and Ⅳ confined water) and analyzed their hydrogen and oxygen isotopes (δ¹⁸O-δD) relations, distributive rules of water salinity, major ions’ relations and hydrochemical characteristics in combination of mathematical statistical analysis, Piper three-line diagram, Gibbs model and hydrochemical characteristic coefficient. The results show that: ① the groundwater in Funing is weakly alkaline in general, mass concentration of cations in both phreatic water and confined water are distributed in the sequence of Na⁺>Ca²⁺>Mg²⁺>K⁺; those of anions in the phreatic water presents as HCO^-₃>Cl^->SO^2-₄>NO^-₃while that in the Ⅱ, Ⅲ and Ⅳ confined water presents as HCO^-₃>SO^2-₄>Cl^->NO^-₃; The total dissolved solids (TDS) of the phreatic water is relatively higher than that of the Ⅱ, Ⅲ and Ⅳ confined water, with locally brackish and saline water; The water quality in the confined area is significantly better than that in the phreatic area. ② The groundwater recharge in the study area is related to the atmospheric precipitation. The phreatic water is closely associated with modern precipitation while the Ⅱ, Ⅲ and Ⅳ confined water mainly sourced from precipitation replenishment in Late Pleistocene or even earlier; ③ The chemical characteristics of groundwater in the region are less affected by precipitation and more controlled by water rock interaction and cation exchange, among which the salinity of the Ⅱ, Ⅲ, and Ⅳ confined water mainly come from the weathering of silicate rocks, and human activities have slight impact on the chemical composition of the groundwater.