Gene segregations of resistance to SMV were studied, using two soybean crosses of Gong-jiao 7901-3 × Marshall and Jilin no.16 × Gong-jiao 7911-2. Parents, F₁ and F₂ plants were inoculated with SMV no.2 and no.3 separately in net-rooms. The SMV strains used for inoculation had been isolated and identified by Lu Wenqin et al., in Notheast Agricultural Coliege. The result indicated that the genes of resistance to SMV strain no.2 in Gong-jiao 7901-3 and Marshall were dominant. The two genes of resistance to SMV strain no.3 from Marshall were independent and dominant. The two genes of resistance to SMV strain no.2 from Gong-jiao 7911-2 were independent and dominant, too. But genes of resistance to SMV strain no.3 from Jilin No.16 or Gong-jiao 7911-2 were recessive. This result proved that there were two independent genes controlling the resistance to SMV strain no.2 or no.3, and their Performance were dependant on host varieties.