In this study,the karyotypes of Oriental hybrids group ‘Siberia’,Oriental hybrids group ‘Manissa’and their interspecific hybrids were analyzed to investigate the genetic characteristics.The results showed that female parent (‘Siberia’) was diploid and male parent (‘Manissa’) was triploid.6 hybrid lines F₁ were diploid,2 hybrid lines F₁ were aneuploid and their number of chromosomes was 25 and 26,respectively.The karyotype formula of ‘Siberia’ was 4m(1SAT)+10st(1SAT)+10t belonging to ‘3B’and ‘Manissa’ was 3m+18st(1SAT)+15t(1SAT) belonging to ‘3B’ according to Stebbins classification of karyotypic asymmetry.F₁ showed different karyotypes,among lines a,b and h belonged to ‘3B’,c,d,e and f belonged to ‘3A’,and g belonged to ‘4B’.F₁ had satellite and more telocentric chromosomes,so they were true progeny,with a genetic tendency to their female parent.