Oxygen intake after surgery is not the longer the better, oxygen intake time is generally based on the severity of the disease. Usually after surgery, oxygen should be inhaled in time, because the patient may not have recovered the respiratory function, so it is necessary to use oxygen to help the patient to breathe, so as to avoid the lack of oxygen and lead to shock and other adverse symptoms. So the time needed is generally based on the condition, not the longer the better. If the patient’s condition is mild, and general anesthesia, generally need to inhale oxygen for 2 to 6 hours, if the oxygen inhalation time is too short may lead to a decrease in blood oxygen saturation in the body, resulting in hypoxia; if the patient’s condition is more serious, such as malignant tumors, such as surgery, usually need to inhale oxygen for three days or so, the patient if the long-term inhalation of oxygen, it may stimulate the respiratory tract and the mucous membrane of the nose, resulting in adverse reactions. The specific duration of oxygen intake should be determined according to the patient’s condition and personal constitution.