Cerebral hemorrhage, also known as cerebral hemorrhage, is a common disease among middle-aged and elderly people. It has a rapid onset and critical condition, and many patients often have serious sequelae, such as hemiplegia, aphasia or sensory impairment, despite active treatment. In addition to conventional infusion, medication, rehabilitation or surgery, hyperbaric oxygen therapy is a good adjunct to the treatment of cerebral hemorrhage. Hyperbaric oxygen can reduce the cerebral edema caused by cerebral hemorrhage, and achieve the effect of lowering cranial pressure. Hyperbaric oxygen has the effect of scavenging oxygen free radicals, while reducing the damage to brain tissue caused by oxygen deprivation after cerebral hemorrhage. 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. Hyperbaric oxygen has a nerve repair effect, which can repair and regenerate damaged nerves. Hyperbaric oxygen promotes the neovascularization of blood vessels and facilitates the establishment of new cerebrovascular collateral circulation. When is it good to treat with hyperbaric oxygen when cerebral hemorrhage occurs? If a patient with cerebral hemorrhage has stable vital signs after no active bleeding, and the clinical review of cranial CT confirms no fresh bleeding, hyperbaric oxygen therapy is possible. Patients with hyperthermia, convulsions, agitation that cannot cooperate with oxygen therapy, and those with excessive blood pressure cannot be rushed into the chamber, and those with contraindications to hyperbaric oxygen therapy cannot be treated with hyperbaric oxygen therapy.