With simulated mowing experiments,the compensation capacity and morphological characteristics of five invasive plant species were studies in greenhouse.The results showed that there were some definite correlations between their compensation capacity and morphological plasticity for most test species.With stronger morphological plasticity under both of mowing and non-mowing,Alternanthera philoxeroides and Mikania micrantha had higher compensation capacity,with their compensation index being 1.65 and 1.27,respectively.The morphological plasticity of Lolium perenne and Bidens pilosa was increased by mowing,thus their compensation capacity was also higher,the compensation index being 1.44 and 1.28,respectively.Ageratum conyzoides had the lowest compensation plasticity because its morphological plasticity was not changed or contrarily reduced by mowing.There were some better mowing periods to suppress morphological plasticity and compensation capacity of five invasive plants growing,which Mikania micrantha with climbing growth,Alternanthera philoxeroides,Ageratum conyzoides,Bidens pilosa and Lolium perenne were before 30 d and after 60 d,after 60 d,40～50 d,before 30 d and 40～50 d,respectively.