Nebulized inhalation has been widely used to assist patients in the treatment of sputum removal, asthma, anti-infection, etc. The efficacy of nebulized inhalation is precise and effective. Compared with other drug delivery routes, nebulized inhalation has many significant benefits, such as deposition in the bronchi and alveoli after inhalation of nebulized liquid, which is conducive to the extensive adhesion of drugs in the lungs, wide exposure, rapid onset of drug effect and long duration of action, and mild side effects due to the absorption of less drugs in the body. Nebulized inhalation is commonly used in clinical practice, especially in chronic obstructive pulmonary disease, bronchial asthma and infectious lung lesions, and has achieved good results. Although nebulized inhalation is good, but should also pay attention to its side effects, such as patients who can not tolerate nebulized inhalation, nebulization may lead to bronchospasm, so that patients wheezing, cough symptoms further aggravated, long-term nebulization may also lead to the occurrence of laryngitis, etc..