中文摘要：

文章通过对河西地区最近150ka河流阶地年龄数据的处理，发现存在7个明显的河流阶地发育时期，即150、100、70、40、30、12和6ka B．P．。经过相关构造和气候资料的论证，文章认为，在150和70kaB．P．附近形成的两级河流阶地代表了河西地区两期主要的构造抬升，而在100、40、30、12和6kaB．P．附近形成的5级河流阶地则对应于河西地区5期气候变化事件。

英文摘要：

Through processing the age data of river terraces in Hexi area since 150 ka B. P. , this article discovers that the river terraces formed obviously at seven different periods including 150 ka B. P. , 100 ka B. P. ,70 ka B. P. ,40 ka B. P. ,30 ka B. P. , 12 ka B. P. and 6 ka B.P. After demonstrated by the correlative tectonic and climatic literature, we hold that the two river terraces formed respectively around 150 ka B.P. and 70 ka B. P. indicate two tectonic uplifts, and the five river terraces formed respectively around 100 ka B. P. ,40 ka B. P. ,30 ka B. P. , 12 ka B.P. and 6 ka B.P. are results of five climatic changes.