The purpose of bronchitis nebulization therapy is generally to relieve bronchospasm, dilute sputum and promote sputum discharge. The following drugs are commonly used: i. β2 adrenoceptor agonists, such as terbutaline and salbutamol; ii. anticholinergic drugs, such as ipratropium bromide; iii. hormonal drugs, such as budesonide, etc. The devices and methods of nebulization therapy are oxygen-driven nebulization and ultrasound-driven nebulization. Oxygen-driven nebulization has certain risks for patients with chronic bronchitis combined with carbon dioxide retention, because the oxygen flow is turned on more during nebulization therapy, and the larger oxygen flow may suppress the patient’s respiratory center and aggravate carbon dioxide retention, which may cause coma in serious cases; ultrasound-driven nebulization has no risk in this regard. Therefore, for patients with chronic bronchitis combined with carbon dioxide retention, it is better to use ultrasound-driven nebulization, and for children with acute bronchitis who want to nebulize, oxygen-driven nebulization can be used.