Based on the field survey, the plant diversity of Changzhou Island, Guangzhou was studied.There are a total of 487 vascular plant species belonging to 358 genera, 127 families on the island, and the dominating vegetation are secondary evergreen broad-leaved forest and artificial vegetation.The diversity and geographical area of the wild plant on Changzhou Island were analyzed, the results indicated that few families are the dominant components of flora, and tropical elements predominate in the flora but there is a degree influence of temperate elements.Finally, suggestions for the protection of plant diversity were proposed.