Abstract: RAPD technique is used tO study the genetic relationship among 4 kinds of aba~ne．The results show that total 538 DNA bands are scoped by 20 effective primers in 4 kinds of abalone，of which 136 DNA bands are reprod ucibly polymorphic，and the percentage of polymorphic products is 25．3％ ；the genetic distance and genetic identity between Haliotis discus discus and H ．discus hannai are 0．28，0．72 respectivdy，those between H ．diversicolor diversicolor and H ．diversicolor supertexta are 0．32，0．68 respectively．In the results of cluster analysis，H ．discus discus and H ．discus hannai are pooled into one group，they both are genetically closer；H．diversicolor diversicolor and H ．diversicolor SUpertexta are pooled into another group，they both also&re genetically closer．