The damage of Mikania micrantha to different plant communities,to every plant species in communities and interspecific associations between M.micrantha and trees or shrubs in the communities were analyzed.The vegetation in study site was damaged seriously by M.micrantha.The average coverage of M.micrantha in herbaceous,shrub community and evergreen broadleaved forest was above 80%,60%,and 30%.Shrubs and trees were damaged hardest by M.micrantha in ratio and degrees of damage,while herbs and liana were damaged slightly.A total of 30 species of trees accounting for 62.5% of those in plots were damaged by M.micrantha.In comparison,29 species of shrubs accounting for 70.73% of those in plots were damaged and 10 species of herbs accounting for 33.33%.The results indicated that 12 species of trees,which accounted for 42.86% of the main trees(28 species) and most of which were heliophytes,showed positive association with M.micrantha.Of which,Leucaena glauca,Celtis austro-sinensis showed significant positive association.Sixteen species of trees,which accounted for 57.66% of the main trees,showed negative association.Cratoxylon cochinchinensis showed significant negative association with M.micrantha,while Liquidambar formasana,Viburnum odoratissimum and Machilus kwangtungensis showed significant negative association with M.micrantha.Eleven species of shrubs,which accounted for 57.89% of the main shrubs(19 species) and most of which were heliophytes,showed positive association with M.micrantha.Nine species of Lantana camara,Vitex negundo var.cannabifolia and Vitex negundo showed significant positive association with M.micrantha.Eight species of shrubs,which accounted for 42.11% of the main shrubs,showed negative association with M.micrantha.Most of them were heliophytes except Psychotria rubra that was shade-tolerant shrub.Four species,Litsea rotundifolia var.oblongifolia,Alchornea trewioides,Ilex asprella and Psychotria rubra,showed significant negative association with M.micrantha.