Abstract:The community structure including species composition, horizontal structure and vertical structure, and the organization structure of Pinus massoniana community on Nan' ao Island were investigated in 1996. The results showed that the community was composed of 28-32 species in 3 plots, and could be divided into 2 tree layers, a brushwood layer and a herb layer. The average individual density of tree layer in 3 plots of the community was 1.7- 3.2 individuals m-2, and the Shannon-Weiner index of diversity was 1 .715 - 3.269. The ecological dominance of the community was 0.223 - 0.102, and the evenness index being 0.439 - 0.818. Pinus massoniana community is a pioneer community on disturbed island which can be developed into coniferous-broadleaf mixed forest.