以潍坊市北部超采区漏斗演变过程中浅层地下水水化学要素为依据，综合运用Radial plot图、box-whisker图、piper三线图解分析了超采区浅层地下水化学成分的演变情况，阐述了硬度、TDS的时空变化规律，揭示了近年来地下水超采影响下该区地下水水质变化规律。结果表明：①超采区水化学类型发生改变，2000年研究区浅层地下水水化学类型以Na+—K+—HCO3-、Ca2+—Mg2+—HCO3-型为主，转变为以Na+—K+—HCO3-—Cl-和Ca2+—Mg2+—HCO3-—Cl-型为主；②超采地下水改变了地下水的流场，增大了入渗补给，加剧水污染，导致总硬度和TDS浓度的增加；③从地下水化学成分的年际变化来看：Na+、K+、Cl-、HCO3-与地下水位波动基本一致，离子浓度随地下水位的变化发生改变。Ca2+、Mg2+、SO42-的含量随着地下水位的降低而升高：地下水超采导致含钙镁矿物和石膏等矿物的溶解增多，入渗量增大，离子浓度升高。

The study analyzed the hydrochemical characteristics of groundwater in over-exploited area of northern Wei Fang and elaborated the temporal and spatial variation of hardness and TDS. Meanwhile, it revealed the law of groundwater quality under the influence of over-exploitation in recent years. It is based on the hydrochemistry elements of shallow groundwater in the over-exploited areas by the comprehensive use of radial plot, box-whisker diagram and Piper diagram. The results showed that:①Hydrochemistry type in over-exploited area changed in the recent years. The chemical types of groundwater were mainly dominated by Na+—K+—HCO3- and Ca2+—Mg2+—HCO3- in 2000, and they were Na+—K+—HCO3-—Cl- ,Ca2+—Mg2+—HCO3-—Cl- in 2012. ②Excessive exploitation of groundwater changed the flow field of groundwater, increased the infiltration recharge and pollution of water, which resulted in the increase of total hardness and TDS concentration. ③From the view of interannual variation of the groundwater chemical composition：Na+, K+, Cl- and HCO3-were the same as groundwater level, and the ionic concentration changed with the fluctuation of groundwater level. Ca2+, Mg2+ and SO42- increased with decreasing groundwater level. Over-exploitation leads to increase dissolution of minerals containing calcium and magnesium and gypsum, thereby increasing the infiltration capacity and ion concentration.