The duration of oxygen intake after altitude sickness varies according to the severity of altitude sickness and the physical condition of the patient. If the patient is a little weak or old, two hours of oxygen intake after plateau reaction is usually enough to relieve the headache, dizziness, fatigue, insomnia and other symptoms caused by plateau reaction. If the patient has cardiovascular disease, and at the same time after the plateau reaction, generally have to inhale oxygen for a longer time, usually is to take low flow, intermittent oxygen treatment. Usually two hours of oxygen inhalation, then two hours of rest, then two hours of oxygen inhalation, and so on, until the plateau reaction symptoms are completely relieved.