在广泛收集唐山沿海地区地表水、浅层地下水和深层地下水水化学分析资料的基础上，研究了区内地下水化学类型分布规律、水化学形成的主要作用和演化趋势。结果表明：唐山沿海地区地下水化学类型具有一定的水平分带规律性。由于区内地下水持续大量开采，造成区内浅层地下水咸化和深层地下水硬度增大。同时，对区内深层地下水进行反向水文地球化学反应路径模拟，模拟结果表明：在模拟水流路径上，深层地下水主要发生方解石、白云石、岩盐、萤石溶解反应和石膏沉淀反应，同时伴随着阳离子交换作用，使得Na(上标 +)和Cl(上标 -)含量明显增加，Ca(上标 2+)和SO4(上标 2-)含量减少，水化学类型将由HCO3-Na型向HCO3•Cl-Na型转变。

On the basis of water chemistry data of surface water, shallow and deep groundwater in Tangshan costal areas, the paper discussed the distribution of water chemistry types, the main causes of water chemistry and its evolution trends. The results showed that the water chemistry types in Tangshan costal areas presented some horizontal zoning regularity. The continuous and excessive exploitation of groundwater in this area caused the salinization of shallow groundwater and the increase in hardness of deep groundwater. Besides, results from an inverse hydrologic geochemistry reaction-path modeling of the deep groundwater in this area indicated that the deep groundwater mainly experienced the processes including the dissolution of calcites, dolomites, halites and fluorites, the precipitation of gypsums, and the cation exchange, during which the concentrations of Na(superscript +) and Cl(superscript -) increased while those of Ca(superscript 2+) and SO(superscript 2- subscript 4) decreased and the water chemistry type turned from HCO3-Na to HCO3•Cl-Na.