The purpose of this study is to investigate the cephalo-facio-dental relationships in the craniofacial complex and their changes with age, and to use them for diagnostic and treatment purposes m the orthodontics. The author studied on the changes of the cephalo-facio-dental relationshrps, using serial lateral cephalometric roentgenograms of 46 boys and 47 girls aged from 6 to 11 years of normal Korean children. Following results were obtained 1. Means and standard deviation of Korean children were obtained. 2. In the evaluation of the craniofacial vertical proportions, lower anterior face was larger than the upper, and upper posterior face was larger than the lower at all ages. 3. The growth change was more prominent in the anterior craniofacial vertical proportion than in the posterior, and growth increment In the upper anterior facial height dimension was larger than in the lower anterior. 4. In the evaluation of the craniofacial horizontal proportion, ANS, Pog, Go and 6 were all situated posterior to their reference arcs, and point B was always situated anterior to the arc passing by point A. 5. Anteroposterior growth change was the most prominent in the mandible, and there was no significant difference between the horizontal growth increment in the cranial base and that in the maxilla. 6. Growth increment in the horizontal direction was larger in the mandibular apical base than in the maxillary apical base. 7. The upper central incisor and the upper first molar were gradually anterior positioned against their reference arcs with age increase. 8. The length of mandibular corpus was larger than that of cranial base from the seven years old, and the difference was increased as the age increased. 9. With age, there was slight difference in the angular relationships formed by craniofacial reference planes and axial inclinations of upper and lower permanent teeth.