The purpose of oxygen nebulization is to use high speed oxygen airflow to form a smoke of the drug, so that the tiny drug particles enter the respiratory tract with oxygen, thus achieving better therapeutic effects. Oxygen nebulization also helps to relieve bronchospasm and improve the airflow restriction of patients, avoiding the symptoms of hypoxia caused by nebulization. In addition, oxygen nebulization can also dilute the sputum and promote its better discharge. When oxygen nebulization, we should pay attention to the following aspects: first, the oxygen flow rate during oxygen nebulization, low flow rate oxygen is not conducive to the effect of nebulization, while high flow rate oxygen nebulization may lead to type II respiratory failure patients respiratory depression, aggravate the degree of respiratory failure, and some patients even form pulmonary encephalopathy, so for type II respiratory failure patients, it is not easy to perform long time oxygen nebulization treatment. Secondly, in oxygen nebulizer treatment at the same time, we should pay attention to avoid fireworks and flammable materials.