Abstract: The aims were to explore the classification method of forage sorghum, and analyze genetic distance between parent materials of forage sorghum. About 50 forage sorghum parents’materials related traits were analyzed, the genetic distance was calculated between each other by discriminate analysis, chi-square minimum distance and chi-square distance UPGMA clustering analysis method. 50 forage sorghum parents materials were divided into two large groups by the clustering analysis, and could preliminary know genetic distance between parents. Two ways to find out the relationships between different materials was valid, it was also having a certain reference value to material selection in breeding. Breeding hybrid and improving the efficiency of hybrid combinations should refer to parent genetic distance to improve strong dominance.