Conveying the low pressure air of raw materials by blower (25 kpa ~ 39 kpa), air purification to remove dust entered into zeolite molecular sieves (ZMS) adsorption tower,produced O2.The N2, carbon dioxide and water vapor in the air by adsorption after reaching set control values, due to the low pressure adsorption, through atmospheric desorption, then reaches a certain degree of vacuum, its regenerated adsorbent adsorption tower impurities completely stripping.Adsorption separation oxygen generation system under the control of PLC system, program-controlled switch to complete the continuous production of oxygen valve cycle.