All the time, oxygen therapy is the most prior clinical therapy to treat hypoxemia, but traditional oxygen therapy may have some deficiencies for some patients. Such as oxygen poisoning, lung failure, respiratory secretion drying, respiratory suppression… Konsung medical promotes home use oxygen concentrators, having increased the function of HFNC (High-flow Nasal Cannula), and it will make up for deficiencies in regular oxygen therapy. High-flow Nasal Cannula（HFNC）means that air oxygen of a certain concentration mixes with high-flow gas then will be transmitted to the patient directly through an unsealed nasal oxygen tube , which can improve patients’ oxygenation levels quickly, and keep the airway PIL1-Phlegm running normally. At present, NCPAP (Nasal Continuous Positive Airway Pressure) are gradually substituted by HFNC, and the medical staffs also realize that it is different from general oxygen therapy and has non-invasive mechanical ventilation, so HFNC is more and more widely applied clinically.