The shallow groundwater hardness has been increasing, which has become a widespread groundwater pollution problem. The paper designed laboratory experiments of leaching to simulate water-soil interaction in the study area to analyse the mechanism of groundwater hardness increment. It is quite necessary for regional protection of quality of underground water, rational development and utilization of underground water. The water sample from underground water, the soil sample include that polluted soil, farmland soil, and clean soil. The results were as follows: Water-soil Interaction can led to total hardness increase on leaching solution; Soluble salt, K+, Na + positive ion and TDS had close relations with total hardness. During water-soil interaction, dissolution effect, cation replacement function replacement and salt effect were occurred and led free calcium magnesium ions, exchangeable calcium magnesium and combined calcium magnesium in soil into groundwater, the hardness of groundwater rise significantly.%浅层地下水硬度呈逐渐升高的趋势,已成为地下水污染的一个普遍问题.设计淋溶试验模拟水-土相互作用的过程,研究地下水硬度升高的机理,对区域地下水水质保护、地下水资源合理开发利用都是十分必要的.试验使用的水样采自地下水,土样包括污染土、农田土、清洁土.试验结果表明:水-土相互作用会导致淋滤液总硬度升高,淋滤液中易溶盐、K+、Na+阳离子及TDS和硬度生成有密切的关系；在水-土相互作用过程中发生溶解作用、阳离子交换作用和盐效应,导致游离态钙镁,交换态钙镁及化合态钙镁进入地下水,引起地下水总硬度升高.
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