The slowing down of blood flow in the basilar artery is not very serious, but if the blood flow in the basilar artery decreases to a certain degree and affects the blood supply to the brainstem and cerebellum, the patient will have more serious symptoms. After further development, if cerebral infarction or cerebellar infarction is formed, patients will have more severe symptoms, such as severe dizziness, nausea, vomiting, ataxia, etc., and need to be treated early. The slowing down of blood flow in the basilar artery is related to the hardening of blood vessels in the cerebral arteries, as well as changes in blood composition and blood viscosity. It is important to control the risk factors related to cerebral arteriosclerosis, and to have a low-salt, low-fat and light diet, as well as to give drugs to activate blood circulation and improve cerebral blood circulation.