In order to study the effect of various levels of dietary energy (2800, 3000, 3200, 3400 ㎉ ME/kg), and protein for starters(21, 23, 25%), for growers(18, 20, 22%), and for finishers (16, 18, 20%), respectively, on the nutrient utilizability, content of abdominal fat, and the size of internal bility, content of abdominal fat, and the size of internal organs, 3×4 factorial experiments were conducted. The results of the present study were summarized as follows 1. The utilizability of experimental diets fed during growing period were significantly different among the treatments. Dry matter and protein utilization of chicks were increased with increasing level of energy and decreasing level of protein. Crude fat utilization of chicks was increased with increasing level of protein. Metabolizability of energy was considerable(p$lt;0.01) improved as the level of energy increased and protein decreased. 2. The main factor determining the amount of abdominal fat deposited was the protein content of the diet in relation to the total energy. Abdominal fat quantity was increased as the energy-protein ratio widened. At each protein levels, high energy groups produced more abdominal fat. 3. No statistical differences were found in the size of internal organs among the levels of protein or energy, the weight of liver tended to increase with increasing levels of dietary protein. 4. Liver fat and liver gross energy values were increased with increasing the level of energy, but no significant differences were found in the liver protein values among the treatments.