Oxygen inhalation is one of the most commonly used clinical treatment methods, oxygen inhalation is mostly operated by nurses, generally the main steps are as follows: 1. Prepare before use, that is, first of all, prepare the humidifier, oxygen tube, flow meter, etc., and at the same time, check whether the equipment is in good condition, including checking whether the oxygen flow meter shows abnormal, whether the humidifier is broken, whether the oxygen tube is smooth, etc. 2. Connect the Open the oxygen valve, turn on the flow meter, connect the oxygen tube, connect the nasal cannula or mask, test whether there is normal oxygen flow, adjust the oxygen flow rate, and check whether the flow meter indicates that the oxygen flow rate meets the requirements, generally the oxygen flow rate of general oxygen is around 2-3L/min. 3, connect the oxygen cannula or nasal mask to the patient, observe the patient’s reaction to oxygen, and adjust or remove it in time if there is discomfort. 4 When the oxygen intake is finished, remove the nasal cannula or mask connected to the patient first, then close the flow meter, and then close the oxygen valve.