The treatment of insufficient blood supply in the posterior circulation mainly includes volume expansion therapy, commonly used drugs include 706 plasma substitute and pulsatilla, etc.; the commonly used drugs to improve blood circulation therapy include shuxu haematoxylin, shuxu haematoxylin, and thrombotoxin. At the same time, the risk factors of cerebral atherosclerosis should be controlled, for example, patients with high blood lipid should be given lipid-regulating and plaque-stabilizing treatments, and the commonly used drugs include simvastatin, atorvastatin, resuvastatin and so on. Patients with high blood glucose should be given hypoglycemic treatment, and the commonly used hypoglycemic drugs include metformin, reglanatide and glycopyrrolate; those with high blood glucose can be treated with subcutaneous injection of insulin; patients with hypertension should be given stable blood pressure control, and should not have their blood pressure lowered too much; and antiplatelet aggregation should be given at the same time.