Concentrator adopts pressure swing absorbers(PSA) to directly concentrate the medical oxygen with high concentration from the air. The machine is cooperated with such diseases as cardiovascular disease, cerebrovascular disease, respiratory disease, altitude response and altitude sickness, geriatric disease, pediatric respiratory tract infection, nocturnal hypoxemia and gas poisoning anoxia in treatment. It is widely used for students, white-collar workers, athletes, the elderly, pregnant women, the futus for mental and physical recovery, assistant therapy and physiological health.