Diagnosis of thoracic spinal stenosis usually requires CT or magnetic resonance imaging (MRI), myelography, and if necessary, electromyography. 1. The examination can clearly show the whole thoracic spine lesion and its location, etiology, degree of compression, and spinal cord damage, and it is the most effective method to confirm the diagnosis. 2. The examination can clearly show the structure of bony spinal canal and ossified ligament, which can provide effective information for surgical treatment, and is mostly used in localized key examination. 3.Spinal myelography, due to trauma, less used in the examination, do not have MRI hospitals can choose.