[Objective] The research aimed to determine the geographic distribution map of system of Rana dybowskii.[Method] Four morphologic indices(body length,body weight,forelimb length,hindlimb length)of eight geographical populations of R.dybowskii which naturally distribute in Changbai Mountain and Xiaoxing'an Mountain were measured.Measure results were variance analyzed and cluster analyzed.[Result] Variance analysis showed:the genetic branching among the Dongfanghong male population(belongs to Wandashan)and Xiaoxing'an Mountain male population and Changbai Mountain male population were significantly different(P<0.05);the genetic branching between the Hebei female population(belongs to Xiaoxing'an Mountain)and Changbai Mountain female population was significantly different(P<0.05).Cluster analysis showed:male R.dybowskii can be divided into three groups:the first group included Quanyang,Tianbei,Chaoyang and Dakouqin,the second group included Tieli and Anshan,the third group included Dongfanghong;and the female R.dybowskii can be divided into three groups:the first group included Quanyang and Chaoyang,the second group included Tianbei and Dakouqin,the third group included Hebei.[Conclusion] The paper deduced that the Sanjiang Plain was the geographical origin center of R.dybowskii which radiated to Changbai Mountain and Xiaoxing'an Mountain along the adverse current of Songhua River basin,therefore,the current distribution pattern of R.dybowskii was formed.
