To evaluate the effect of electroacupuncture (EA) of Sanyinjiao (SP 6) on perimenopausal syndrome (PMS).Multicentral randomized controlled trials and single blind test were adopted in the present study. A total of 157 PMS patients were randomly divided into EA group (n=81) and medication group (n=76) . EA (2/100 Hz, 8-10 mA) was applied to bilateral Sanyinjiao (SP 6), 3 times a week and for 3 months (mon). Patients of medication group were treated by oral administration of nylestriol, 2 mg/time, twice a mon for 3 mon. For PMS patients, medroxyprogesterone (6 mg/d, for 10 days) was added from the third mon on after the treatment. The therapeutic effect was evaluated by using "symptoms-signs score scale", and changes of serum estradiol (E2), follicle stimulating hormone (FSH) and luteotrophic hormone (LH) were detected by chemiluminescence immune assay. Kupperman index was determined before and after the treatment.In comparison with pre-treatment, Kupperman index of EA group decreased significantly (P 0.05).EA of Sanyinjiao (SP 6) is able to regulate serum E2, FSH and LH levels and effectively improve perimenopausal syndrome.