In order to select higher yielding forage suited for silage, the yield performance and associated characteristics of 23 introduced sorghum-sudangrass hybrids (Sorghum bicolor (L.) Moench) have been evaluated at the Experimental Livestock Farm, COA, SNU, Suweon in 1979 and 1981. The results obtained are summarized as follows: 1. NK 367, Pioneer 931 and FS 24 gave significant highest forage yields than the control variety, Suweon 19 hybrid corn (P $lt; 0.05). There were no significant differences in forage yield between FS 4, FS 25A, T-E TDN, X 4318, Silo Milo and Suweon 19 hybrid corn, but these sorghum-sudangrass hybrids were the better forage producers. 2. Average grain percentages to the total forage yield of various hybrids tested ranged from 9.8% for FS 24 to 44.8% for FS 351 except NK 367. The grain percentages of FS 351 and Silo Milo were the highest and similar to that of Suweon 19 hybrid corn where 43.5% grain was obtained. 3. FS 251, NK 326 and FS lA headed and flowered early than other hybrids, while Pioneer 931, T-E TDN, X 4318 and Pioneer 944 showed later. NK 367 was the latest hybrid in maturity. 4. NK 367 and Pioneer 931 were found to be as tall type hybrids, while FS 251 and FS 351 appeared short types. Although no diseases and lodging were found in most hybrids, T-E Goldmaker was susceptible to leaf disease and SS IV gave severe lodging during the growing season. 5. The results indicated that Silo Milo, X 4318, FS 25A and T-E Silomaker have high silage yield potential with moderately high grain, and NK 367, Pioneer 931, FS 24, T-E TDN and FS 4 also have high yield potential with relatively low grain.