During the study of the numerical taxonomy,60 OTUs and 18 characters have been studied and analyzed by means of Q-classification and R-classification,respectively,3 methods of numerical taxonomy and 11 operations have been analyzed.The best method for Q-cluster of Meloidogyne is the median cluster based on the distant of Tschebyscheff,by which the phenetical relationships of the species are graphically summerized and directly perceived and for R-cluster is median cluster based of distance of P.C.Mahalanobis,by which the phenetical relationship between the quantitative characters,the qualtative ones and between the quantitative and the qualitative are well expressed.It has a similar result as the one of the stuby on weights.The study results of Q-cluster show that there is no differenciation of genus among 60 OTUs between unit distances (interspecies) ,the genus Hypsoperine should belong to genus Meloidogyne.Next,H.acronea and M.acronea not gathering in a group until D=400,probably should not be the same species but two individuals.In addition,M.incognita wartellei and M.incoginta meet in a group only on D=20,that means they have an rather close relationship.