[Objective]Genetic relationships among cultivars of Lonicera japonica were studied. [Method]Genetic diversity and genetic relationship of 31 varieties of L. japonica in Jiaodong Region were studied by using Random Amplified Polymorphic DNA( RAPD) molecular marker technology. [Result]5 primers were used to amplify 650 bands. Each primer could amplify 0-9 bands. The result of cluster analysis showed 31 kinds of L. japonica varieties could be divided into two categories,one was from Taibai Top of Kunyu mountai...