Species diversity of plant communities of Eupatorium adenophorum and Eupatorium odoratum inhabit was measured by using the indices of species Simpson index,Shannon-Wiener index,Pielou index.The results showed that the relevant indices in Eupatorium adenophorum inhabit were lower than that in inhabit without the species by 43.65%、55.13%、55.68%.The indices in Eupatorium odoratum in inhabit were lower than that in habit without the species by 33.55%、37.78%、17.98%.It illustrate that the species diversity of plant communities of Eupatorium adenophorum and Eupatorium odoratum inhabit were comparatively reduced.