Abstract: Forests consisting of the Dipterocarpaceae have been found in the southeast, south and southwest of Yunnan Province. The forests can be divided into seven types, three of which are excellent mixed forests dominated by trees of Dipterocarpaceae. This article deals with the distributions, habitats, compositions, the characteristics of the community organization, the growing stock and preliminary information of natural regeneration of every kind of the Dipterocarpaceae forests. By the comparison it shows that the Dipterocarpaceae forests in Yunnan are very similar to the tropical rain-forests of Southeast Asia in components, vertical zone of distribution, etc.The dense Dipterocarpaceae forests are rich in aggregate components and have great productivity. They are the valuable natural resources of our country. We must take vital and effective measures for their protection. Further more, to fit in with the needs of forests, we should explore the scope of the Dipterocarpaceae trees and make reasonable use of them.