Under normal circumstances the human arterial oxygen saturation is 98%, venous oxygen saturation is 75%, whether a person’s health, from the oxygen saturation can be reflected, low oxygen saturation will appear shortness of breath, insufficient energy supply, fatigue and other symptoms. In life, you need to enhance lung function through exercise to maintain normal blood oxygen saturation. Exercises to improve cardiopulmonary function include appropriate running, swimming, brisk walking and other exercises. Other diseases may also cause low values of blood oxygen saturation, such as pneumonia and obstructive lung disease, which need active treatment. There are many clinical diseases that can cause insufficient oxygen supply and affect the blood oxygen saturation, which directly affect the normal metabolism of cells and even seriously threaten people’s lives.