Abstract: Abstract to have classified the vegetation in Qiaojia dry-hot river valley of Jinsha River in Yunnan systematically by the method of French-Swiss phytosocio-logical school, we have got a result that the local vegetation is composed of one order, two alliances, four associations hierarchically: Dodonaeo-Heteropogonctalia contorti I . Phyllantho-Heteropogonion contorti 1. Barlerio-Heteropogonetum contorti 2. Arthracio-Coriarietum nepalensis 3. Calotropetum giganteae II . Opuntion monacanthae 4. Selaginllo-Opuntietum monacanthae This result has been verified by the method of hierarchical agglomerative clas-sification (Group-average). We have described environmental, floral and ecological characters of the local vegetation minutely in this paper. A vegetational comparison between Qiaojia and Yuanmou dry-hot river valleys has been also given here.

Key words: Dry-hot river valley