Insufficient cerebral blood supply in cervical spondylosis can be examined by MRI, digital subtraction angiography and transcranial Doppler. 1. MRI: It can find out whether there are osteophytes, herniated discs, and the degree of nerve and spinal cord compression in cervical spondylosis, and perform angiography to see whether the vertebral artery is compressed and deformed. 2. Digital subtraction angiography: A catheter is inserted into the blood vessel to be examined, and a contrast medium is injected to find out whether the blood vessel is narrowed or blocked. 3. Transcranial Doppler examination: It can detect the hemodynamic parameters of each major artery in the arterial ring of the skull. It is a non-invasive vascular examination. Cervical spondylosis cerebral blood supply insufficiency can appear headache, dizziness, blurred vision and other symptoms timely medical diagnosis and further treatment.