Objective To compare the postoperative analgesia effect of ultrasound- guided quadratus lumborum block( QLB) and transversus abdominis plane(TAP) block in Caesarean delivery with median incision in the lower abdomen . Methods Eighty patients undergoing Caesarean delivery with the median incision of the lower abdomen, ASA I or II, were divided into group Q(n=40) and group T(n=40) randomly. Puerperants were scheduled for Caesarean delivery under combined spinal and epidural anesthesia with median incision in the lower abdomen,after surgery,Patients in group Q received an ultrasound-guided QLB with 20ml of 0.375% ropivaeaine injecting to thoracolumbar fascia after quadratus lumborum on each side,Patients in group T received an ultrasound-guided TAP block with 20ml of 0.375% ropivaeaine on each side.The resting and exercise VAS scores and the consumption of sufentanil Postoperative at 4,8,12,24 and 48h were recorded.The incidence of postoperative adverse reactions in the two groups was recorded, and the patient's satisfaction with postoperative analgesia was recorded. Results There was no significant difference in resting VAS score between the two groups after operation. The exercise VAS scores at 8,12,24,48h after operation in group Q and the consumption of sufentanil were significantly lower than these in group T.The incidence of adverse reactions in group Q decreased. Conclusion Ultrasound-guided bilateral QLB with 20 ml of 0.375% ropivacaine can reduce the consumption of opioid drugs after caesarean delivery, reduce the exercise VAS score and improve the patient's satisfaction.