Nebulized inhalation therapy is a more convenient way of local drug delivery and has significant therapeutic advantages over other delivery methods, such as oral and intravenous infusions. After inhalation, the nebulized drug can act directly on the respiratory mucosa and various receptors under the mucosa, and can exert a powerful therapeutic effect locally. There are fewer systemic side effects, and the dosage of the drug is relatively low and the side effects are relatively mild. Clinically, it is mostly used in the treatment of respiratory diseases, such as bronchial asthma and chronic obstructive pulmonary disease. For patients with infectious lung diseases, such as bronchiectasis with infection and pneumonia, nebulized inhalation can also be done, which can dilute sputum and diastole bronchial tubes. Also some antibiotics can be nebulized to strengthen the anti-infection. For patients who have established artificial airway, through nebulized inhalation, the airway can be humidified and bronchospasm can be relieved. For nasopharyngeal diseases, such as acute pharyngitis, tonsillitis, epiglottitis, can also be nebulized inhalation of hormones and other drugs, can play a good therapeutic role.