When performing multiple-level decompression, the skin incision will be centered at the midpoint between selected intervertebral disc levels. The incision can be mobilized one level above or below after releasing the underlying connective tissues. Then we can set up the tubular retractor system through separate muscular portals for each level. For patients with small stature, we can perform a three-level surgery through a single surgical wound, just as the same size as we perform the single-level surgery.