The slowing down of the blood flow in the basilar artery is not serious, but if the blood flow in the basilar artery decreases to a certain extent and affects the blood supply to the brain stem and cerebellum, it will lead to more serious symptoms. If cerebral infarction or cerebellar infarction develops, the patient will have more serious symptoms, such as severe dizziness, nausea, vomiting, ataxia, etc. Early treatment is required. 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. Risk factors for cerebral atherosclerosis should be controlled with a low-salt, low-fat, light diet, and medications that activate blood circulation and improve cerebral blood circulation should be given.