There is no exact rule for daily oxygen intake in heart failure, as the severity of the disease varies from patient to patient, so the time of oxygen intake also varies. The purpose of oxygen intake is to correct hypoxia caused by various reasons, promote metabolism and maintain the vital activities of the body. Oxygen plays a decisive role in enhancing the immune system, and proper oxygen intake is conducive to promoting blood circulation in the skin, making the skin elastic and improving the quality of sleep. Heart failure patients can first through the oxygen tube for oxygen, if the symptoms can not be relieved can be changed to face mask oxygen, still does not relieve the consideration of non-invasive ventilator continuous positive pressure oxygen, according to the patient’s condition of heart failure to choose the best way to give oxygen. Patients with chronic heart failure can choose low-flow oxygen intake 1~3 liters per minute, oxygen concentration is below 3 liters. Acute heart failure patients can choose high-flow oxygen 4~6 liters per minute, oxygen concentration of more than 4 liters, can not arbitrarily adjust the oxygen flow and oxygen concentration. Patients need to cooperate with the doctor to decide the time of oxygen intake according to the specific disease, do not adjust by yourself. Once there are symptoms of oxygen toxicity, such as dyspnea, fainting, dry cough, the oxygen concentration should be adjusted downward or stopped immediately.