Ventilator use, its parameters in fact, according to the patient’s physiology, and the condition of the adjustment, its parameters are not uniform, for normal people: 1, respiratory rate: adjusted at 15-20 times / min; 2, the ratio of expiration and inspiration: that is, the ratio of inhalation and expiration, generally choose between 1:1.5-1:2.5; 3, peak expiratory flow rate: in 40-100L / min, the clinical general in 60L/min, the routine use is 60L/min; 4, tidal volume: about 10-15ml/kg; 5, trigger sensitivity: according to different ventilators choose different trigger sensitivity. For ARDS patients, that is, patients with acute respiratory distress syndrome, it is necessary to let him breathe slower and give a small tidal volume. For the tidal volume, 5-15ml/kg can be used, 15ml/kg can be given to a larger patient, and a small tidal volume can be given to a smaller patient with acute respiratory distress syndrome.