There are obvious symptoms of low back and leg pain and intermittent claudication. Patients often have low back and leg pain when walking one or two hundred meters, and the symptoms will be relieved or disappear immediately after bending down to rest for a while or squatting, and if they continue walking again, the pain will appear again soon. The symptoms are aggravated when the spine is posteriorly extended and reduced when it is forward flexed. In a few cases, the compression of the cauda equina and nerve roots affects the bowel and urine, and even causes incomplete paralysis of the lower extremities. Patients with spinal stenosis often have many complaints but few signs. On examination, the spinal deflection is not obvious, the lumbar spine is normal, and only posterior extension pain is present. Straight leg raise test is normal or only moderate pulling pain. In a few patients, the muscles of the lower limbs are atrophied and the Achilles tendon reflex is sometimes diminished or absent.