Through investigating the population change of Cinnamomum camphora(L.) Presl. in Wuxi City, the research found that C. camphora(L.) Presl. in the past century had already become common species from rare species, then explored the causes, advantages and disadvantages of the change. In view of sustainable development of urban greening, zonal vegetation and fl ora, this paper explored the scientifi c and reasonable application of tree species and also protection of urban plant diversity.