Posterior circulation ischemia has a very high rate of disability and death, and must be treated promptly. If the infarction is considered to be posterior circulation, it can be treated by intravenous thrombolysis within 3 hours of the onset of the disease. If a hospital is in a position to do so, arterial thrombolysis can be performed, and the time window for treatment can be appropriately relaxed. However, if the patient has emergency conditions that are not suitable for thrombolysis, other options should be given, for example, if the patient has high fibrinogen, fibrin-lowering treatment with bactrim should be given. If the patient is considered to be caused by cardiogenic dislodgement of emboli, anticoagulant drugs should be given to treat the patient, which can be treated by intravenous augatroban, and edaravone should be given to promote the recovery of neurological function in the acute phase During the treatment period, it is also important to control the risk factors associated with cerebrovascular disease.