Abstract: The genomic DNA polymorphisms of 14 species of Chinese Ziziphus, 11 varieties of Z. jujuba Mill. and one outgroup were analyzed by using random amp lified polymorphic DNA (RAPD). A total of 921 RAPD bandswere amplified by 31 random p rimers, amongwhich 919 (99.78% ) were polymorphic. The data of 921 RAPD bands were used to generate Diceps similarity coefficients and to construct a dendrogram by means of UPGMA in the NTSYS-pc program. It is concluded as follows: All samples were classified into six kinds at genetic similarity 0126. The results canpt support the classification of Sect. and Ser. on Z iziphus that based on single character. Z. jujubaMill. and Z. acidojujuba C. Y. Cheng et M. J. L iu. should be treatedas one species. In the same way, Z. xiangchengensis Y. L. Chen et P. K. Chou and Z. montana W. W.Smith should be treated as one species. Infraspecific classification of Z. jujubaMill. should be classified into two subspecies, which were given new Latin names. It is agreed that the varieties of Z. jujuba should be merged into Z. jujuba.

Key words: Ziziphus Mill., phylogenetic relationship, RAPD