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本文讨论了河北平原地下咸水的同位素组成。并且依据水文地质、水化学和同位素特征将咸水成因分为两种类型，即大陆盐化成因和海水成因咸水。前者δ１８Ｏ＜－７．００‰，δＤ＜－５５．０‰，３６Ｃｌ／Ｃｌ＞５７±９（×１０－１５），１４Ｃ年龄为１０００～４０００ａ（校正）；后者δ１８Ｏ＞－７．００‰，δＤ＞－５５．０‰，δ３７Ｃｌ值接近海水值，１４Ｃ年龄大于１００００ａ（校正），咸水中的海水百分比大于３８．０％。
This paper discusses the isotopic composition of brackish water in the Hebei Plain. Based on the characteristics of hydrogeology, hydrochemistry and isotope, the causes of salt water are divided into two types, that is, the salinization origin of continental salinization and the saltwater origin of seawater. The former δ18O <-7.00 ‰, δD <-55.0 ‰, 36Cl / Cl> 57 ± 9 (× 10-15), and the age of 14C is 1000-4000a (corrected); the latter δ18O> -7.00 ‰ , ΔD> -55.0 ‰, δ37Cl value is close to the seawater value, and the 14C age is greater than 10000a (corrected). The percentage of seawater in salt water is more than 38.0%.