The purpose of this study was to investigate the effects of circuit training on body composition, blood lipid, vascular compliance, and isotonic strength in obese middle aged women. 20 obese (percentage of body fat ≥ 30%) middle aged women were recruited from public health center. For intervention participants, their body composition (body weight, percentage of body fat, fat free mass), blood lipid profiles(TC, TG), vascular compliancd(upper hand,lower foot), and strength were measured at before and after the intervention. Subjects were divided into two groups; circuit training group (n=23), control group (n=23). First, After 12 weeks, body weight, percentage of body fat were significantly decreased in the circuit training group compared to the control group. Second, After 12 weeks, TC, TG were significantly decreased in the circuit training group compared to the control group. Also, vascular compliance and isotonic strength were significantly effectiveness in exercise groups. It was concluded that circuit training program has positive effect on promoting body composition, lipid profile, vascular compliance and isotonic strength in obese middle aged women.