Hyperbaric oxygen for cerebral hemorrhage is effective because it is widely used in clinical practice as a form of rehabilitation after cerebral hemorrhage. The main function of hyperbaric oxygen for cerebral hemorrhage is to reduce cerebral edema after cerebral hemorrhage because it will cause cerebral edema, and hyperbaric oxygen has the effect of reducing cerebral edema and achieving the purpose of reducing intracranial pressure. Hyperbaric oxygen also has the effect of scavenging oxygen free radicals, because after cerebral hemorrhage, blood metabolites are very likely to cause brain tissue damage. If hyperbaric oxygen therapy is performed early, it is helpful for scavenging oxygen free radicals. Hyperbaric oxygen can increase the diffusion distance of brain tissue capillaries, thus correcting the hypoxic state of the body. Hyperbaric oxygen is also beneficial to the repair of neurological function, which can promote the repair and regeneration of damaged nerves, and it can also promote the regeneration of neovascularization.