The purpose of this study was to examine the effect of exercise and diet control program on blood pattern in obese children. The subjects of this study were five obese boys aged from 8 to 12 participating in the control period(C) for 3 days, exercise period(E) for one week, and exercise+energy restriction period(EER) for another one week, consecutively. The intensity of the exercise was 60~70% of HRmax and the energy was restricted at 493kcal/day. Daily mean total energy intake was 2,152${pm}$138kcal. 1,861${pm}$138kca1, and 1,368${pm}$87kcal for the period C, E and EER, respectively. Body weight of after the program was significantly decreased from 48.94$pm$5.11kg to 45.94${pm}$4.74kg(P<0.01). And skinfold thickness. %fat. lean body mass, body mass index were significantly decreased(p<0.01). Blood sugar concentration was not significantly affected by weight loss, but alkaline phosphatase activity was significantly decreased. Concentrations of total lipid, LDL-cholesterol, triglyceride, phospholipid were not significantly decreased. But concentrations of HDL-cholesterol, %HDL-cholesterol, free fatty acid were significantly increased and concentration of VLDL-cholesterol, atherogenic index were significantly decreased. The results of this study showed that the obese children had a tendency to decrease coronary heart disease risk in the respect of plasma HDL-cholesterol and VLDL-cholesterol concentration by the exercise plus energy restriction program. Thus if we apply the lower intensity or duration of exercise for them this program might be more effective on the obese children.