At present, the indications for intervertebral fusion of lumbar disc herniation are mainly the following: 1, huge disc herniation, accompanied by fibular ring and cartilage end plate prolapse, serious damage to the disc structure; 2, spinal canal stenosis, decompression is extensive more than 1/3 of the synovial joint, affecting the stability of the lumbar spine; 3, dynamic position film shows lumbar instability; very lateral disc herniation, the need to remove the synovial joint. In addition, when performing intervertebral fusion, it must be noted that the amount of bone graft must be sufficient! The fusion device has a limited amount of bone grafting, and I believe that its main role is early support and stability, and the final fusion needs to be completed by intervertebral bone grafting, which should be fixed by the posterior nail system at the same time.