Abstract: The random amplified polymorphic DNA procedure (RAPD) was used to study the genetic diversity of potato varieties abroad, which were to clear the genetic relationship of these varieties and provide the theoretical basis for selecting and breeding of fine potato varieties. The genetic diversity of 24 potato varieties abroad were analyzed using 29 selected RAPD primers. The result showed that there were 165 bands amplified with 29 RAPD primers, in which 116 bands were polymorphic, and the polymorphic rate was 70.3%; The coefficients of genetic similarity among 24 potato varieties were ranged from 0.514 to 0.816, with an average of 0.667; The variety pairs with similarity coefficients less than 0.6 only accounted for 7.25%; 24 potato varieties could be divided into 2 classes and 6 subclasses. These results suggest that the genetic similarity is high and the genetic base is narrow among 24 potato varieties abroad.