Brain tissue has no reserves of glucose and oxygen and brain cells are very sensitive to cerebral hypoxia. The best time to treat cerebral hypoxia is as early as possible. Generally speaking, if the blood flow in the cerebral artery is suddenly interrupted, brain cells will stop brain electrical activity in about 2 minutes, and irreversible damage will be caused to brain cells in about 5 minutes. Therefore, once cerebral ischemia and hypoxia occurs, it should be treated as early as possible in order to improve the cerebral blood supply, so as to make the supply of blood be restored and to avoid the death of brain cells. The most common disease leading to cerebral ischemia and hypoxia is acute cerebral infarction, for this kind of patients, intravenous thrombolysis should be used within 4.5 hours to restore the blood supply and oxygenation of the brain tissues, which can reduce the degree of disability and save more brain cells. Other diseases, such as carbon monoxide poisoning, neonatal ischemic-hypoxic encephalopathy and other causes of cerebral hypoxia should be actively targeted at the cause of treatment. In conclusion, the treatment of cerebral ischemia and hypoxia should be as early as possible, and the cause of cerebral hypoxia should be actively relieved, so that the earlier the blood and oxygen supply to the brain tissues are restored, the more benefits the patients will get.