The procedure of posterior discoscopy is orthoptic fluoroscopy, incision, exposure of the intervertebral plate space, exposure of the intervertebral disc, removal of the herniated nucleus pulposus, and suturing of the incision. 1. Orthostatic fluoroscopy: orthostatic fluoroscopy is used to determine the horizontal projection of the intervertebral disc and mark it. 2. Incision: take the incision in the middle of the back and extend it to one lumbar vertebra above and below the diseased intervertebral space, generally 4~8cm long. 3. Exposure of the intervertebral space: after incising the skin, subcutaneous tissue, and supraspinous ligament, the soft tissues are peeled off in the direction of the vertebral plate, and the vertebral plate and articular eminence are fully exposed. 4. Exposure of the intervertebral disc: Entering the spinal canal and removing the ligamentum flavum, the protruding intervertebral disc and the compressed nerve root can be found in the diseased intervertebral space. 5. Remove the protruding nucleus pulposus: drill holes in the protruding intervertebral disc with a circular saw or cut the posterior longitudinal ligament or annulus fibrosus of the protruding area with a sharp knife, and use a nucleus pulposus forceps to remove the protruding intervertebral disc tissue. 6. Suture closure of the incision: the incision is flushed with isotonic saline, and the placement of drainage strips can be decided according to the intraoperative bleeding situation. Remove the working channel cannula and suture the lumbar dorsal fascia, subcutis and skin. Posterior discoscopic surgery requires strict bed rest for 5~7 days, do not walk on the ground to prevent wound bleeding or formation of edema compression of nerves causing recurrence of symptoms.