[ Objective ] To observe the effects of acupuncture in treating extraweight rats and on morphology of brown adipocytes. [ Methods ] Sixty SD rats were randomized into normal group ( group A), model group ( group B) and acupuncture group (group C). Group A was fed with common forage and groups B and C with high-fat diet for 12 weeks. After then group C was given acupuncture of Zusanli (ST36) and Neiting (ST44) points for 15 days. Body weight, body length and Lee's index were compared before and after treatment in the three groups; wet weight of perirenal fat was detected and the ultrastructure of interscapular brown adipose tissue was observed under transmission electron microscope after treatment. [Results] After treatment, body weight, Lee's index and wet weight of perirenal fat were decreased in group C (P