Objective To compare the analgesic efficacy of ultrasound-guided continuously postoperative adductor canal block and femoral nerve block after arthroscopic menisectomy. Methods 40 patients for elective menisectomy were assigned to two groups randomly, adductor canal block group（ACB）and femoral nerve block group（FNB）with 20 cases each. The adductor canal block and femoral nerve block after the continuous epidural anesthesia .0.5% ropivacaine 20ml was given.VAS at rest and movement in postoperative 2,6,12,24h,quadriceps muscle strength,side effects and additional analgesic dose were recorded. Results There was no significant difference in the VAS between the two groups. There was significant difference in the quadriceps muscle strength in postoperative 2,6,12h（P﹤0.01）. There was no significant difference in the quadriceps muscle strength in postoperative24h. There was no headache, nausea and vomiting, urinary retention and other adverse reactions observed in both groups. Conclusions The efficacy of analgesia was no difference postoperatively. Adductor canal block preserved quadriceps muscle strength better than femoral nerve block in postoperative 2,6,12h.