The purpose of this study was to at 78 female students in M and O middle school, Seoul, who are overweight and have a %body fat of over 27 % to measure their body compositions, blood pressure and atherosclerosis. The results of this study are as follows. 1)height and body compositions, significant differences in weight, BMI and %body fat(p<.05), as they were higher in %body fat group, but there were no significant differences in height, WHR, body fat mass and basal metabolic rate 2)physical fitness, there were no significant differences in endurance, muscular strength, flexibility and agility, and students who were higher in % body fat, had poor reflexes 3)blood pressure and heart rate, students with a higher % body fat, showed significantly increased systolic blood pressure(p<.05), and there were no differences in pulse pressure, diastolic blood pressure and heart rate. 4)atherosclerosis factors, students who were higher in % body fat, had a higher pulse wave velocity(p>.05), whereas the ankle brachial index lowered(p>.05). 5)cardiovascular risk index, As students were higher in % body fat, the cardiovascular risk index increased. Moreover, the cardiovascular risk index had a positive relation with weight, BMI, body fat mass and % body fat(p<.01), however, it had no relation with physical strength. In conclusion, it is considered that reducing the % body fat is most important to lower the cardiovascular risk index of teenagers and that development and supply of exercise programs considering physical strength development in adolescence would not only help their growth, but reduce the cardiovascular risk in adulthood, by preventing obesity.