对雅鲁藏布江大峡弯河谷地区热带森林植被情况进行了调查分析。论述了造成该地区热带植被概况及其被破坏的自然因素和人为因素。并对该地区植被在次生演替的各个时期植被种类成分的变化，群落结构，建群种生长速度等进行比较研究，结果如下：Ａ．自然因素导致的次生演替主要经历了下列６个价段：（１）尼泊尔桤木（Ａｌｎｕｓｎｅｐｏｌｅｎｓｉｓ）阶段；（２）尼泊尔桤术单优群落阶段；（３）原生植被主要树种侵入阶段；（４）尼泊尔桤木林衰退阶段；（５）原生植被恢复阶段；（６）原生植被建立阶段。Ｂ．人为因素导致的次生演替主要经历有下列５个阶段：（１）高大禾草或热带高草阶段；（２）野芭蕉侵入生长阶段；（３）喜阳树种侵入或恢复生长阶段；（４）杂木林阶段；（５）原生植被恢复及建立阶段。最后讨论了植被次生演替规律对自然植物区系的影响和对治理山地，保护该地区生物多样性，合理利用资源及发展生产的重要性及意义。 The tropical forest vegetation in the Daxia River valley of the Brahmaputra was investigated and analyzed. Discusses the general situation of the tropical vegetation in the area and its destruction of natural and human factors. A comparative study was made on the changes of vegetation types, community structure and the growth rate of constructive species in different periods of secondary succession in this region. The results are as follows: The secondary succession caused by natural factors mainly experienced the following six price ranges: (1) Nephelium stage (Alnusnepolensis); (2) Neotropical plantation stage; (3) primary tree species invaded stage; ( 4) Nepali deadwood forest decline stage; (5) primary vegetation restoration stage; (6) primary vegetation stage. B. The secondary succession due to human factors mainly includes the following five stages: (1) tall grass or tropical high grass stage; (2) wild banana invaded growth stage; (3) Xi Yang species invade or resume growth stage; ( 4) Miscellaneous wood forest stage; (5) Primary vegetation restoration and establishment phase. Finally, the influence of secondary succession of vegetation on the flora of natural plants and the importance and significance of the management of mountainous areas, the conservation of biodiversity in the area, the rational utilization of resources and the development of production are discussed.