Abstract: During the past years, from 1958-1963, it has been the gobd fortune of the writet to Study on the composition of populations designed in the permanent quadrats at the Yunnan Biogeocoenological Station of Tropical Forest. It is author's aim to research the real state of different populations in this com-munity.Basal on this,the author has calculate its process of historical development and the possibility of futural xevolution, which can give a basis for managing this tropical forest.

Key words: preliminary, composition of plant, tropical forest, Southern Yunnan