For patients who need high-flow oxygen therapy, they can quickly switch to high-flow mode, provide patients with gas that is fully heated and humidified, and at the same time adjust the oxygen concentration and flow rate, which greatly increases the convenience of clinical operation; By transporting high-flow gas, a certain level of PEEP can be maintained to keep the alveoli open; Flushing of anatomically ineffective cavities by providing patients with a constant, adjustable, high-velocity air-oxygen mixture; Provide accurate constant temperature, constant humidity of high flow gas to increase patient comfort; Reduced upper respiratory tract resistance and respiratory work in patients;