中秦岭更新世以来间歇式隆升作用使得流经此地的乾佑河谷两侧发育多层溶洞.应用230Th铀系法测定了3层溶洞中位于古潜水面位置附近的12个碳酸岩样品,年龄结果表明这3层溶洞开始抬升并接受沉积的最早时间分别为358±38,247±28和118±19ka,结合高差得出河谷下切速率在358～247ka期间为0.23±0.02mm/a,在247～118ka期间为0.19±0.03mm/a,晚更新世以来（118ka至今）的下切速率高达0.51±0.08 mm/a.这表明中秦岭358ka以来构造隆升具有越来越强烈的变化趋势. Since the Pleistocene uplift in the Qinling Mountains, multiple layers of karst caves developed on both sides of the Qiangyou Valley flowing through the region, and 12 carbonate samples located in the vicinity of the ancient diving surface in the three karst caves were determined by the 230Th uranium series method. The results showed that the earliest time for the three karst caves to start uplift and deposit was 358 ± 38,247 ± 28 and 118 ± 19ka, respectively. The combined height difference indicated that the rate of undercutting in the valley was 0.23 ± 0.02mm / a between 358 and 247ka, The cut rate was 0.19 ± 0.03 mm / a during 118 ka and 0.51 ± 0.08 mm / a since the late Pleistocene (118 ka till now), indicating that the tectonic uplift of the middle Qinling Ridge had a stronger and stronger trend since 358 ka.