||This study evaluates the effects of electrical stimulation on body composition and the meridian system in postmenopausal women with obesity. Forty-one postmenopausal women were recruited in Taiwan. The body composition was used as a screening test for obesity (percentage of body fat: > 30%, waist circumference: > 80 cm). The experimental group (EG, n = 20) received modulated middle-frequency electrical stimulation treatment for 20 min twice a week for 12 consecutive weeks at the Zusanli (ST36) and Sanyinjiao (SP6) acupoints. The control group (CG, n = 21) did not receive any intervention. The measurements of body composition and the meridian system were recorded for both groups in the pre- and post-study. The results showed that the data of body composition (weight, waist and hip circumference, percentage of body fat, and percentage of lean muscle mass) changed considerably in the EG (p < 0.05); however, no significant difference was observed in the CG. The left triple burner meridian changed notably in both EG and CG throughout the study (p < 0.05), however there was no difference between the two groups in the overall mean value, up-down ratio, qi and blood ratio, and yin-yang ratio. Our findings suggest that modulated middle-frequency electrical stimulation could help to improve body composition in postmenopausal women with obesity, potentially providing them with better care and health by integrating Western medicine and traditional Chinese medicine.