The operation steps of oxygen cylinder oxygen intake are divided into the preparation of articles, oxygen intake operation, and informing patients of precautions. 1. Preparation of articles: The articles to be prepared for oxygen absorption include oxygen cylinder, disposable oxygen tube, flow meter, humidifying bottle, distilled water, cotton swab, tape, wrench, treatment bowl, etc. 2. Oxygen operation: help the patient to take a comfortable position, use the wrench to install the flow meter, the humidification bottle is filled with the appropriate amount of cold distilled water installed in the flow meter, connect the oxygen tube, open the main valve to observe the amount of gas in the bottle, open the flow valve to see the humidification bottle in the gas out, the end of the oxygen tube immersed in saline in the therapeutic bowl to observe whether the gas is out. 3. Oxygen intake operation: After confirming that the oxygen tube is smooth, adjust the required flow rate. Wipe the nasal cavity with a cotton swab dipped in saline, clean the nasal cavity of foreign bodies, put the oxygen tube into the nasal cavity of about 2~3cm, and use the tape to fix it, and ask the patient whether he/she feels the gas outflow. 4. Inform the patient of the precautions: after the operation is completed, explain to the patient again the precautions, not to adjust the flow of gas, keep away from fire, do not move the oxygen cylinder and so on. After the completion of all the above matters to check the items, clean up the garbage, pay attention to the oxygen need to be under the guidance of the doctor, do not operate on their own.