Neoclassical canons defining the relationships between various areas of the head and face were formulated at the Renaissance, but decreased its usefullness according to development of the reconstructive and plastic surgery. The exact knowledge of not only underlying skeletal structure but also soft tissue morphology were needed. The purpose of the this study is to test the validity of the nine neoclassical canons comparing them with the normal data obtained by measurement of a young adult Korean population, and to establish new facial proportion in young adult Korean. Facial proportions were measured with 200 young adults and age-related qualities were investigated in six of nine canons with 200 six-year-olds, 200 twelve-year-olds, and 200 eighteen-year-olds. All the measurements were done by one author due to decrease error. The incidences of each canons and their variations were determinated and mean differences, minimum and maximum differences were calculated. In the average young adult Korean face constructed from the combined mean value of males and females, height of head was 20.4% smaller 4.6% than canon face, forehead was 26.0%, upper face was 26.3%, and lower face was 27.3%. The gnathion was placed at 4.6% upper portion from center. Nose length was 7.21mm shorter than the ear length. In the horizontally oriented proportion, interocular distance was larger than eye fissure length, nose width was larger than mouth width and nose width was larger than facial width. In age-related difference of facial proportion relatively smaller forehead and larger nose length were observed and no change was observed in lower face with age. In horizontally oriented facial proportion, nose width was rapidly increased than interocular distance, mouth width and facial width. Results were as followings ; 1) Neoclassical canons were not appropriated for the canons of young adult Korean facial proportion. So, they were no validity. 2) Age-related differences were observed but difference between sexes was not observed. 3) The canons of young adult Korean facial proportion were maybe valuable in reconstructive and plastic surgery of head and face.