Heredity charactersistics and utiliration value of 4 parents resistant to Soybean Mosaic Virus (SMV) had been revealed by and analysis of F 1、F 2 and BC 1 population from the crosses among them. Ha 91R 3-182, Ha 91R 3-188 had two recessive complamentary genes resistant to No. Ⅲ strain of SMV. The segregation ratio in F 2 between resistant and susceptible was 7∶9. Ha 91R 3-310 had two dominant complemtary genes contralling resistance to No. Ⅲ strain of SMV, the segregation ratio in F 2 between resist...