Abstract: The quantitative characteristics,plant frequency in layers and species diversity of David involucrata var. vilnoriniara,Euptlea pleiosperma,Stewartia sinensis and Pterostyrax psilophtila communities at Dalaoling National Forest Park Reserve of Yichang were studied qualitatively and quantitatively.The community composition and structure were made clear,the succession courses and stages of the communities were revealed,and the role of these rare trees on the succession course of communities and the cause of being in imminent danger were analyzed,which provided a theoretical basis for protecting the rare trees in the Three-Gorge reservoir area.