To compare the effect of pelleted ration and all-mash ration containing isoprotein and isocalorie (20%-2650 ㎉/㎏) on the body composition of broiler chicks, this experiment was carried out. The results obtained were as follows: 1. There was no significant difference between pelleted ration and all-mash ration on the dry matter content of chicks. 2. In the body composition on wet or dried basis, chicks fed pelleted ration contained significantly (P$lt;0.01) more fat than those fed all-mash ration. On the other hand, the protein, ash and calcium contents were significantly (P$lt;0.01) higher in the chicks fed all-mash ration than in the chicks fed pelleted ration. 3. Female chicks contained significantly (P$lt;0.05) more fat than male but the contents of protein and calcium was significantly (P$lt;0.05) higher in the male chicks than in the female chicks. 4. However, phosphorus content of chicks on the wet basis was not affected by ration or sex of birds. On the dried basis, chicks fed all-mash ration contained significantly (P$lt;0.01) more phosphorus than chicks fed pelleted ration did. 5. Caloric value of the chick tissues fed pelleted ration was significantly (P$lt;0.01) higher than that of chicks fed all-mash ration on the wet or dried basis.