Sorghum-sudangrass hybrid (Sorghum bicolor (L.) Moench) is one of the most important annual grasses utilized for supplemental summer forage. For better forage production, this experiment was carried out to investigate the effect of the different nitrogen (N) rate and cutting height on the appearance, dry weight, death of new bud (branch and tiller), and dry matter yield of sorghum-sudangrass hybrid. The cultivar used in the present study was Pioneer 988. The experiment was arranged as a split plat design and undertaken over a period of 5 months from May to September, 1981 and 1982 in Suweon, Korea. The frequency of the branching was decreased as the low stubble height, and the rate of the tillering was decreased in the high stubble. And the low cutting height resulted in the increased number of dead bud. However, the appearance and death of branch and tiller were not influenced by high N. Tillering is more important than branching in influencing yield. The yield of forage mostly depended on the tiller, regardless of cutting height, especially at the low stubble height. And minor portion of the yield was resulted from the branch. No significant difference between dry matter yield and cutting height was found. However, the yield tends to increase in the high stubble height and high N fertilization. The regrowth and dry matter yield were influenced by climatic conditions significantly. These results suggests that the low stubble height of 5 ㎝ was recommended on sunny days with high temperature, while the high stubble of 15 ㎝ on rainy days or low temperature, and the 150 to 200 ㎏/㏊ N fertilizer for the maximum production of forage sorghumsudangrass hybrid.