The purpose of this study was to analyze the curve of morphological growth and functional developments of Korean Youth from 12 to 17 years old. Anthropometric (Height, body weight and chest girth) and physical fitness (strength, power, endurance, agility, coordination, flexibility, and speed) measurements were male on 7771 males and 8088 females in 44 junior and 44 senior high school students in every districts. Summary The results were summalized as follows ; 1) The urban area students show the better development in the physical conditions like the height, body weight, chest girth, etc. than the rural area students. 2) The development of the physical conditions of the students has been greatly increased since the enforcement of the Bill of Physical Strength. 3) The Physical development of the students between 1974 and 1976 in far more remarkable than that between 1972 and 1974. 4) The improved physical fitness of the students appears most remarkable in throwing, sit up but the Physical fitness for long distance running has suffered a slight setback. 5) The urban area students show the better development of physical fitness in all the entries except long distance running, in which the rural area students, male or female, have proved to be superior.