In recent years, vertebral decompression and interbody fusion techniques have been widely used in clinical practice. However, open surgery intervertebral implant plus pedicle screw fixation is more traumatic, with a wider range of stripped muscles, more bleeding and longer operation time. At present, minimally invasive spine surgery has become a trend in spine surgery. Our newly introduced expandable channel tube minimally invasive surgery system is a new minimally invasive spine technology, which is based on the principle of having expandable working channels of different lengths, and through the tapered (flared) expanded channel at the bottom, greater exposure can be obtained, thus completing the arch root internal fixation surgery that could only be done by traditional surgery in the past. Together with our original discoscopic surgical system and surgical headlamp and magnification, it can be applied to the surgical treatment of most degenerative diseases of the lumbar spine, including common lumbar spinal stenosis, lumbar spondylolisthesis, lumbar instability and lumbar disc herniation. The advantage is that the spinal canal is decompressed to a large extent using minimal bone destruction, resulting in complete nerve root decompression and good decompression effect, while significantly reducing muscle damage and the incidence of postoperative low back stiffness and pain, as well as reducing bleeding and the probability of postoperative infection.