Epidural anesthesia is a regional block in which the anesthesiologist selects the puncture point based on the area of innervation in the region where the procedure is performed. Epidurals can be punctured in one point or in two points. If the scope of surgery is relatively large, two points of puncture are chosen according to the area of surgery; if the scope is relatively small, a single point of puncture can be taken entirely. To achieve a satisfactory anesthetic effect, it is also possible to adjust the dose of epidural anesthetic to achieve a satisfactory anesthetic effect. In addition, if resistance is encountered during the puncture process and difficulties are encountered, it is perfectly possible to change to the implementation of anesthesia within the spinal canal of the adjacent segment at this time to achieve close to a very good anesthetic effect.