Single release is a surgical method to treat lumbar spinal stenosis. By loosening the unilateral lamina and articular process, the nerve root canal is enlarged and the nerve root compression is reduced. Narrowing the width is a kind of plastic surgery. Through osteotomy and internal fixation, the excessively wide cheekbones are reduced and the facial contour is improved. The treatment objects, purposes and methods of these two operations are different and cannot be confused.