祁连山东段北麓的河流阶地系列是青藏高原阶段性隆升的地貌标志. 通过古地磁、热释光、放射性14C测年及黄土-古土壤地层序列对比, 初步确定祁连山东段沙沟河的5级主要阶地和洪积台地分别形成于约830, 418, 250, 140和10 ka. 阶地特征与成因分析表明, 由基座阶地构成的主要阶地系列是构造上升形成的, 5级主要阶地揭示了祁连山东段最近830 ka存在5次强烈隆升事件, 它们发生的年代大致相当于这5级阶地的形成年代. 同一级阶地内, 由副阶地构成次级阶地系列. 气候变化在其形成上可能起了重要的作用. The series of river terraces at the northern foot of the eastern section of Qilian Mountains are the landform signs of the stage uplift of the Qinghai-Tibet Plateau. By comparing paleomagnetic, thermoluminescence, radioactive 14C dating and loess-paleosol sequences, The major terraces of Stage 5 and the floodplains are formed at about 830, 418, 250, 140 and 10 ka, respectively. The terrains and genesis analysis show that the major terraces consisting of base terraces rise up from the structure and the major terraces of level 5 reveal During the last 830 ka in the Qilian Mountains, there were five strong uplifts that occurred roughly equivalent to the formation age of the five terraces, and the second terraces formed by the second terrace in the same terraces. May play an important role.