The normal physiological function of the human brain depends on adequate blood supply, although its weight accounts for only 3% of body weight, the blood vessels account for about 20% of the heart’s blood volume. Insufficient blood supply to the brain. Stenosis of the blood supply arteries in the brain includes both intracranial and extracranial stenosis, which is the main cause of insufficient local blood perfusion in the brain and cerebral thrombosis or embolism dislodgement, thus producing corresponding transient ischemic attack (TIA), ischemic symptoms such as dizziness, limb weakness, numbness, unstable walking, slurred speech, blurred vision, and even severe stroke. The death and disability rates of stroke are extremely high, and the treatment is not effective. But on the contrary, if the narrowing of the cerebral blood supply artery is detected in time and treated with standardized medication or surgery, it is often possible to prevent stroke as well as recurrent ischemic events and improve one’s quality of life. It also avoids the burden to family and society. Therefore, patients with ischemic symptoms should have MRI angiography, CT angiography and cerebral angiography and other vascular examinations as early as possible to clarify the presence of arterial stenosis and take corresponding standardized treatment for the disease to improve blood supply to brain tissue and prevent strokes. If a stroke has occurred, the vascular condition should be clarified and treated promptly after recovery to prevent another stroke.