Oxygen partial pressure above absolute atmospheric pressure is called hyperbaric oxygen. The application of hyperbaric oxygen therapy is called hyperbaric oxygen therapy. Hyperbaric oxygen therapy, carried out in a hyperbaric chamber at a pressure of 2.5 to 3.5 ATA, has the following effects when oxygen is inhaled under high pressure: increasing the solubility of oxygen in the plasma, promoting the diffusion of oxygen from blood vessels to tissues; increasing the content of oxygenated hemoglobin; and inhibiting the reproduction of anaerobic bacteria. Hyperbaric oxygen therapy can rapidly correct the tissue hypoxia of the body and reduce and restore the tissue damage caused by hypoxia. Hyperbaric oxygen therapy can significantly increase the partial pressure of blood oxygen and blood oxygen content, reduce cerebral edema, reduce intracranial pressure, increase oxygen supply to damaged cells around the hematoma (ischemic semidark area), and promote the regeneration of capillaries, thus promoting the repair of brain lesions and the establishment of collateral circulation. Hyperbaric oxygen therapy for cerebral hemorrhage is mainly due to the following characteristics: 1. Hyperbaric oxygen can reduce cerebral edema caused by cerebral hemorrhage, while achieving the effect of lowering cranial pressure. 2, hyperbaric oxygen has the effect of scavenging oxygen free radicals, while reducing the damage to brain tissue caused by oxygen deprivation after cerebral hemorrhage. 3.Hyperbaric oxygen obviously increases the blood oxygen content and partial pressure of blood oxygen, and increases the diffusion distance of brain tissue capillaries, which can correct the state of brain tissue hypoxia and repair the brain tissue damaged by hypoxia. 4.Hyperbaric oxygen has nerve repair effect, which can make damaged nerve repair and regeneration. 5, hyperbaric oxygen can promote the neovascularization of blood vessels, which is conducive to the establishment of new cerebrovascular collateral circulation.