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Wu Bangxing (Department of Biology, Nanchong teacher's College, Sichuan)  
This paper present a species of extraneous weed that is native to the Andes of the south America. Now, it has become the wide distribution in low altitude region of the southern Yunnan. According to data and investigation, we know that Eupatorium odoratum has extended from thailand through Burma to the southern Yunnan since 1930. Moreover, in these areas it can be set foot, the wide-spread, naturalized, and often formed a secondary consociation, has directly connection with temperature. There are some essential characters from the eco-biology view, such as the wide ecological amplitude, for heliophilous can not tolerant shade-moist, fast growing in a year, the strong capability of the germination and the tiller, many a seed output but very light as one of them, root system in the upper layer of soil, ect. A fundamental characteristics of Eupatorium odoratum community is a very clearly aggregation. The floristic composition, structure, and the habitat of the community are mixed. Therefore, it may be classified into three phases of development, i. e. primary phase, abundant phase, final phase. Finally, Eupatorium odoratum may be used medicine, evergeen firtilizer and some control methods to it.
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