1.Increase the partial pressure of blood oxygen and increase the oxygen content of blood. 2.Increase the distance of oxygen diffusion in the capillaries of brain tissue. 3.Increase the blood flow in the basilar artery of brain, which is beneficial to the repair of brainstem reticular structure and promote wakefulness. 4.The hyperbaric oxygen treatment can produce the phenomenon of counter-stolen blood in the area of brain lesion, which can increase the blood flow in the area of lesion. 5.Lower the viscosity of blood and facilitate the blood flow. 6.Accelerate the capillary proliferation in the area of lesion. 7. Increase oxygen partial pressure in the ischemic semidark (shadow) area around the lesion, activating dormant nerve cells in the ischemic semidark area. 8. Increase the ability of phagocytes in the lesion area to engulf and digest the remains of necrotic tissue cells, accelerating the clearance of the lesion and creating conditions for tissue repair. 9. Promote the regeneration of nerve cell axons, growing new lateral branches, establishing new neural connections, especially restoring The neural connections and functions of the reticular upward projection activation system are restored.