By RAPD,the rich genetic polymorphism were surveyed between parents CS-R6 and CS-RD181,CS-R63 and CS-R268,and their hybrids(CS-R6.181(F_1),CS-R63.268(F_1)).By calculating genetic distance,it was suggested that the appropriate genetic distance could bring about the stronger heterosis while not the lager distance.Castor material had displayed the genetic heteroplasmy using RAPD marker analyzing the individuale.