Blood oxygen is the oxygen in the blood, and the normal body oxygen content is about 90%. The higher the oxygen content in the blood, the better the person’s metabolism, of course, high blood oxygen is not a good phenomenon. Blood oxygen in the human body have a certain degree of saturation, too low will cause the body oxygen insufficient, too high will lead to physical cell aging. The concentration of blood oxygen has a direct relationship with the partial pressure of oxygen, which is the tension generated by oxygen molecules dissolved in the plasma in a physical state. The partial pressure of oxygen in arterial blood of a normal person is about 100mmHg. If the partial pressure of oxygen does not fall below 60mmHg, there will not be a significant decrease in blood oxygen saturation. If the partial pressure of oxygen is lower than 60mmHg, the content of oxygen in the blood will show a rapid decline, and blood oxygen saturation is commonly used in clinics to reflect whether the human body is hypoxic.