Abstract: The bamboos of Xishuangbanna are investegated and studied based onthe principle and methods of Ethnobotany. Bamboos distribute over Southeast Asia and southern China. Because ofthe advantageous nature condition, special culture of minority nationalitiesand religious belief, Dai nationality and other minority nationalities whoreside in Xishuangbanna have developed tranditional custom and experienceof understanding, growing and using bamboos. There is quite great area ofnatural as well as artificial bamboo forest. A great amount of work such as the revision of literatures on bamboosand field work including investigation and specimen-gathering have beenachieved. Each genus of bamboos found in Xishuangbanna is studied respe-ctively in the present paper. The authors analyses and discusses the floisticrelation of bamboos between Xishuangbanna and the related regions accordingto the methodlogy of floristics. In the author's opinion. the floristic rela-tion between Xishuangbanna and Southeast Asia is regarded as the closestone. There is relative close relation between Xishuangbanna and the southe-astern and western Yunnan. The relation between Xishuangbanna and central Yunnan and Eastern China is less. And there is obvious difference betweenXishuangbanha and Southern China floristically.

Key words: Xishuangbanna, Distribution of bamboo genera, Floristic characters