The length of time a patient can live with oxygen below 60% depends on the patient’s condition and lung function, and should be analyzed on a case-by-case basis. Patients with blood oxygen below 60% suggest hypoxemia, which may be accompanied by hypercapnia. If the patient does not undergo standard treatment, the body basically belongs to the state of hypoxia, which will lead to carbon dioxide retention, thus leading to respiratory acidosis, followed by systemic organ dysfunction, which is more harmful, and the survival time of the patient is usually not more than 12 hours. If patients can actively use ventilator, give sufficient oxygen and other symptomatic treatment to ensure stable vital signs and acid-base balance, and can gradually increase blood oxygen to 80%-90%, or even reach the physiological state of normal people, they can generally survive for a long time. Therefore, patients with blood oxygen lower than 60% need to go to the hospital immediately for emergency treatment, timely oxygen therapy, as well as lung CT, electrocardiogram, cardiac ultrasound and other examinations to clarify the cause and symptomatic treatment.