The purpose of this paper was to evaluated a effect of aerobic exercise for obesity high school student. The subjects were 20 obesity boys and 20 obesity girls as above 25% body fat. The exercise program of this study composed to intensity of $60{pm}10%$ HRmax, 4 day/weeks and $40{sim}50$ min/day during twelve weeks. The results were summerized as follows : 1. There were significantly decreased on T-cholesterol, LDL, Triglyceride between pre and post tests of exercise group and HDL-cholesterol was significantly increased but no significant difference of the non exercise group in men. 2. There were significantly decreased on T-cholesterol, LDL, Triglyceride between pre and post tests but no significant difference in HDL of the exercise group in women. 3. There were no significant difference between men and women.