横断山脉南部,在澜沧江与金沙江之间有一系列呈南北方向展布的高山与峡谷。在云南大理附近有一点苍山(图1),山的高度为3000—5000米,山峰与谷地之间高差可达2000 —3000米。在这些陡峻山脉的山麓区,发育有新生代与现代的磨拉石沉积,笔者在研究点苍山的抬升与山前磨拉石沉积的基础上,对藏东与滇西新生代以来的构造运动与演化提出 Traverse the southern mountains, in the Lancang River and Jinsha River between a series of north-south distribution of the mountains and valleys. There is a little Cangshan near Dali, Yunnan (Figure 1). The height of the mountain ranges from 3000 to 5000 meters and the elevation difference between the mountain and the valley can reach 2000 to 3000 meters. In the foothills of these steep mountains, the Cenozoic and modern molasse deposits were developed. Based on the research on the uplift of the Cangshan and the pluton deposition of the piedmont, the author analyzed the tectonic movement since the Cenozoic in eastern Tibet and western Yunnan Proposed with evolution