Hemianesthesia, including epidural anesthesia, lumbar anesthesia and combined lumbar and epidural anesthesia, is a common anesthesia method used for cesarean section at home and abroad. The advantages are that the anesthetic effect is precise; the muscle relaxation effect can meet the surgical needs, there is no stimulation inhibition for fetal respiratory circulation, and it is conducive to postoperative analgesia, so it is widely used in elective cesarean section anesthesia. Another advantageous aspect of choosing hemi-anesthesia for cesarean section is that the mother can stay awake, and the occurrence of reflux and asphyxia is beneficial for resuscitating the mother and reducing the occurrence of risks.