The study was undertaken to establish the cephalometric standard of Hellman dental age IV A group of Korean. The subjects consisted of 40 males and 44 females with normal occlusion and aceptable profile. The results were obtained. 1) The tables of standard deviation from the measurements were obtained. 2) All linear measurement was greater in male than in female. 3) Female had more convex profile than male. 4) Facial convexity, upper and lower lip of esthetic line were gradually decreased with age. 5) Upper incisor was gradually labioversioned with age.