Abstract: The floral composition and the higher plant species diversity of the Heptacodium miconioides community in the Tiantai Mountain of Zhejiang Province were analyzed.According to the statistics of nine plots, there are altogether69families of seed plants(including varieties) which can be subdivided into 186species, 143genus.Most of them are distributed in the temperate zone in terms of the geographic composition of seed plant genera.In the vertical structure of community, both the species richness and species diversity index of the second sublayer of tree layer are much greater than those of the first sublayer, and their evenness is of slight different significance.The various indexes of diversity between the tree layer and the shrub layer have slight differences.The species richness and species diversity index of the tree layer and shrub layer are obviously bigger than those of the herb layer.The Heptacodium miconioides community has a high composition diversity of species, genus and family, the community has a great variety of plants whose composition is complex.