Patients with cerebral infarction do not need oxygen all the time. Cerebral infarction is a kind of ischemic cerebrovascular disease, which occurs due to the blockage of arterial vessels in the brain, resulting in ischemia and hypoxia in the distal blood supply area, causing necrosis of brain cells and thus producing a series of clinical symptoms of the disease. Because this disease is essentially caused by ischemia and hypoxia, early administration of oxygen to patients with cerebral infarction can alleviate the condition of cerebral hypoxia to a certain extent, reduce the rate of progression and aggravation of cerebral infarction, have a certain possibility to alleviate patients’ clinical symptoms and promote neurological function recovery. However, long-term oxygen inhalation can easily lead to hyperoxemia in patients, and may induce oxygen toxicity if irregular. Therefore, except for patients with heart disease or underlying lung disease, oxygen is usually administered only in small amounts during the acute phase, with low-flow continuous oxygen supply for a duration of about 7-10 days or even shorter.