To date,few studies have addressed the relationship of clonality and invasiveness of alien invasive plants in large geographical scale.The 112 alien invasive plants in North Carolina of America were analyzed.The results showed that the percentage of the strongest invasiveness plants,the stronger invasiveness plants,the weaker invasiveness plants in all invasive plants are 24.1%,44.6% and 31.3%.There are 67 invasive clonal plants (59.8%),whose mainly reproductive types were stolon and tiller.The percentages of annual or biennial herbs,perennial herbs,aquatic herbs,tree,shrub,vine and bamboo in total invasive plants are 23.2 %,20.5%,8.9%,7.1%,23.2%,15.2% and 1.8%,with clonal plants accounting for 46.2%,82.6%,100%,62.5%,34.6%,58.8% and 100%,respectively.With the increase of invasiveness,the percentages of invasive plant originated from Asia are 45.7%,66% and 74.1% in three ranks,and those originated from Europe are 45.7%,30% and 14.8%.Data mentioned above indicated that clonality of the invasive plants in North Carolina may be contributed significantly to their invasiveness,and Asia and Europe were the primarily geographical origin of these alien invasive plants.