The partial pressure of oxygen in the blood is mainly the molecules of oxygen in the blood, the tension produced. The more oxygen there is in the blood, the higher the concentration, the corresponding partial pressure of oxygen will also rise, which can make the metabolic balance of carbon dioxide discharge and oxygen inhalation to maintain a normal state. Clinically, when the partial pressure of oxygen in the blood is lower than 60mmHg, it indicates that the body is in a state of hypoxia, which belongs to type I respiratory failure and hypoxemia, and at this time, oxygen can be treated according to the different conditions and causes of the disease. If it is chronic obstructive pulmonary disease, you can choose continuous low-flow oxygen. If the cyanide poisoning patient is carbon monoxide poisoning caused by hypoxia, you can choose a high concentration, high-flow oxygen inhalation, so that the partial pressure of oxygen in the body gradually rise, can restore normal cardiopulmonary function.