Abstract:The aim was to discuss the evolvement mechanism of plant functional traits in island, the functional traits of wild plants in Pingtan Island and Fuzhou National Forest Park were compared. The result showed that common families of wild plants in Island and continent accounted for 63% of total families, and common species accounted for 19% of total species. Herbaceous plants in island accounted for 65.75% of total plants for adapting to strong wind, drought and barren environment. The leaf-size class of island plants was smaller than that of continental plants. The plants with hairy leaves accounted for 62.39% of total plants in island, and tended to be lignified and succulent. Island plants mainly adapt r-reproductive strategy with high reproductive ability. The florescence of island plants was longer than that of continental plants. The spreading ability of island plants improved with high caryopsis and achene proportion, while drupe and berry proportion was low. The mini fruits accounted for 79.20% of total plants in island. The main dispersal mode of island plants tended to be wind force and heterogyna. In general, the wild plants in island and continental had the same origin; however, to adapt to fragile island eco-environment, the functional traits of island plants related with adaption-reproduction-dispersal ability had been evolved, showing strong adaptability to radiation, improved reproductive ability and spreading ability.