Abstract: Six house-feeding male northeast fine wool sheep in growing stage were selected and divided into 2 groups according to their bodyweights. The bodyweights of Group 1 were （26.9±3.39） kg and that of Group 2 were （34.85±0.35） kg. The gas respiratory calorimetry experiment and digestive metabolism experiment were performed on the sheep fasting for 72-96 h by applying respiratory calorimetry equipment with open circuit. The results indicated that the oxygen consumption quantities of Group 1 and 2 were （8.89 ±0.59） and （9.53±3.44） L/（W^0.75.d）, their creation quantities of CO2 were （7.44±0.45） and （6.7±1.10） L/（W^0.75.d）, their respiratory quotients in fasting period were 0.71 and 0.67, their fecal nitrogen excretion amounts were （0.17±0.06） and （0.14±0.08） g/（W^0.75.d） and their urine nitrogen excretion amounts were （0.42 ±0.11 ） and （0.24±0.11 ） g/（W^0.75.d）.