Intradural injection is the most reliable, widely used and feasible method of analgesia recognized by the domestic and foreign anesthesia community, and epidural analgesia is the method with the least complications among intradural analgesia. Advantages: 1.The analgesic efficiency is more than 95%, especially suitable for women with moderate to severe labor pains. 2.Mothers are awake, have to eat and drink, and can participate in the whole process of labor. 3.No motor block, and can walk on the ground. 4.Flexible to meet the anesthesia needs of forceps and cesarean section, and buy time for the early end of labor. 5.With the emergence of new drug ropivacaine, the effect of labor analgesia has been improved, and there is almost no effect on mother and child and labor. There is no effect on the mother and baby and the labor process. The low concentration of ropivacaine and the obvious sensory-motor separation phenomenon can achieve the real sense of walkable labor analgesia.