Abstract:The field investigation was carried out in the communities, in which Lycoris radiata was distributed. The result showed as following: (1) Species composition of the communities and weed density were decreased by the growth of L. radiate. (2) Population density of Phytolacca acinosa, Athyrium frizellia and some species of Gramineae were rapidly decreased as well, which reduced the indecies of species diversity and increased the evenness of weed communities. (3) Indecies of Jaccard’s and Sorensen’s similarity of the communities, where L. radiata was distributed, were significantly different from those without L. radiata. All these indicated that L. radiata obviously changed the composition and structure of weed communities, and effectively controlled the growth of weeds.