Abstract Sampling and analysis for contents of Ca2+, Sr2+ and ratios of 87Sr/86Sr in groundwater were carried out in Quaternary aquifer in Beijing Plain. It is shown that Ca2+ and Sr2+ in groundwater mainly come from water-rock interaction, and are not closely related with the sources of groundwater; they undergo a similar hydrogeological processes, which can be used to trace the water-rock interaction processes; the samples can be divided into two groups according to the concentration of Sr2+; that with a lower concentration of Sr2+corresponds a higher ratio of 87Sr/86Sr, and that with a higher concentration of Sr2+ corresponds a lower ratio of 87Sr/86Sr; ratios of 87Sr/86Sr are mainly controlled by water-rock interactions, which are generally different from those of sea and local precipitation; Sr2+ in groundwater comes mainly from carbonate rocks, and sees age effects distinctly. The concentration of Sr2+ in groundwater in the Yongding River Basin is greater than that in the Chaobai River, and the ratios of 87Sr/86Sr in groundwater are generally increasing along the flow path.
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