Abstract: Ecological and traditional theoretical biology experiments were conducted to study the allometric growth of larval and juvenile clown anemonefish Amphiprion ocellaris at their early life stage, thus providing fundamental data in artificial propagation of clown anemone fish. The 11^th day post hatch of fish was the junction between the larval and juvenile clown anemone fish. The results indicated that organs of feeling, feeding, and swimming developed and differentiated rapidly with allometric patterns during the larval and juvenile stage. As for head organs, snout length, eye cross, mouth width and head height exhibited positive allometric growth in larval stage, while the snout-gill slit distance and eye diameter exhibited negative allometric growth. As for torso region organs, body height, trunk length, tail length, caudal peduncle length, caudal peduncle height and body thick exhibited positive allometric growth in larval stage, and only head length exhibited negative allometric growth. As for swimming organs, caudal fin, dorsal fin, pectoral fin, pelvic fin and anal fin all exhibited positive allometric growth. In juvenile stage, the head, torso and swimming organs of the clown anemone fish were all negative allometric growth. The allometric development of the key organs of clown anemone fish has important ecological significance for adapting to changes in environmental factors.