In order to evaluate the effect of Chekambohyulansin-tang (CST) which was a traditional poly-herbal formula has been used for treatment of obesity in Korea, on the obesity in ovariectomized rats, the changes of body weight, peri-kidney, abdominal and perineal subcutaneous fat weight and their histological changes were measured with the detection of number and/or size of adipocytes after an oral administration of CBT extracts (125, 250 and 500 mg/kg, respectively). CBT significantly attenuated elevations in the body weight, the absolute and relative weight of peri-kidney, abdominal and perineal fat tissues and decrease the severe hypertrophy, the number of adipocytes, and the diameter of adipocytes of peri-kidney, abdominal and perineal fat tissues in ovariectomized rats in a dose dependent manner. These results provide a story evidence that CBT can playa role in the treatment of obesity induced by ovariectomy. Determination of the specific mechanisms involred toxicological dosage of CBT on obesity will require addition study.