A retrospective study of 15 cases of ameloblastoma in children and adolescents was performed. During the period of evaluation, 46 patients with ameloblastoma were seen, of which 15(32.6％) cases were in the patients aged 18 years or younger with the mean age of 14.5 years. There was more prevalence in male (1.5: 1). All the cases occured in the mandible, the molar and ramus area was the most frequent location(66.7％), and the most frequent sign was swelling of the face or jaw. Radiographically, 11(73.3％) cases manifested unilocular leion. Cortical expansion and root resorption were presented in 14(93.3％) and 11 (73.3％) cases respectively. Pexiform and plexiform unicystic types were common in the ameloblastoma occured in young patients.