石羊河、黑河流域地下水氦同位素组成的研究表明，大部分样品的3He／4He具有大气降水特征，部分地区地下水4He同位素的过剩是基岩裂隙水和卤水的混合作用所致，祁连山前深大断裂带附近地下水的氮同位素具有明显的馒源氦特征，说明该断层的活动仍未停止。 The study on the helium isotope composition of groundwater in Shiyanghe and Heihe Watersheds shows that 3He / 4He in most of the samples have the features of atmospheric precipitation. The excess 4He isotope of groundwater in some areas is caused by the mixing of bedrock fissure water and brine, The nitrogen isotope of groundwater near the fault zone has obvious characteristics of mantle helium, indicating that the fault activity has not stopped.