Twenty weaning pigs of Landrace breed were used to study the effect of level of dried sweet potato pulp (0, 10, 30, 50%) as a replacement for grains and brans in rations fed to pigs from weaning to market weight on the drylot performance, carcass quality and feed cost per ㎏ gain. 1. Average daily gain for 0, 10, 30 and 50% level of sweet potato pulp were 711, 701, 684 and 670g respectively and tended to decrease as the level of sweet potato pulp in the ration increased. However there were no statistical differences Feed required per ㎏ gain were 4.02, 4.22, 4.24 and 4.35㎏, respectively which tended to increase as the sweet potato pulp level increased. 2. As the level of sweet potato pulp increased, the carcass became softer with tender lard and loin eye muscle area and dressing percentage tended to decrease. 3. Coeffecients of apparent digestibility of sweet potato pulp were; for dry matter, 99%; crude protein, 60%; crude fat, 16%; nitrogen free extract, 97% and crude fiber 72% and its total digestible nutrient content was found to de 72%. 4. Feed cost per ㎏ gain were 117, 118, 111 and 101 won, respectively and it was the cheapest at the highest level of sweet potato pulp used. 5. Above results indicated that up to 30∼50% level of sweet potato pulp in the ration allowed satisfactory gains, feed efficiency, carcass quality and feed cost per ㎏ gain.