Four groups were divided based on surgical types and postoperative analgesia regimens, with 20 cases in each group: primary cesarean section + postoperative analgesia with sufentanil plus flurbiprofen axetil group(Group SF1), primary cesarean section+postoperative analgesia with sufentanil group (Group S1), repeated cesarean Section + postoperative analgesia with sufentanil plus flurbiprofen axetil group(Group SF2), and repeated cesarean section+ postoperative analgesia with sufentanil group(Group S2). Analgesia regimen: PCIA,100 ml; sufentanil 100 ug, ramosetron 0.3 mg, flurbiprofen axetil 100 mg (varied in groups); backgroup dosage 2 ml/h, PCA 2 ml each time, lock time 20 min. The scores of incision pain and uterine contraction pain 24 h, 48 h and 72 h after operation and the dose and pumping times of analgesia pump 24 h after operation were recorded.