Abstract:Based on the data investigated in the last decade and the survey of sampling plots of about 10 hm2, the floristic composition of formation Dacrydium pierrei/Syzygium araiocladum was studied of tropical montane rain forest in Bawangling Nature Reserve located around the border between Changjiang and Baisha counties on Hainan Island. Three hundred and twenty six species in 137 genera and 61 families are involved. The dominant species and the number of species in main families as well as monotypic and oligotypic species are reviewed．The world distribution pattern of all taxa investigated is described and analysed． It is shown that tropical elements，in particular， tropical Asia elements are the main Ones ，followed by pantropic．Species and genera endemic to China are very limited，but monotypic and oligotypic genera are rich in the flora．