Nebulizer inhalation therapy is a common treatment method in clinical practice, mainly applying nebulizer device to disperse the drug into fine droplets in the form of aerosol spray and achieve the therapeutic effect by inhalation through the nose or mouth. Because it is a local drug in the respiratory tract, the site of action is direct, the local drug concentration is high, reducing the adverse effects of systemic application of drugs, so it is widely used in clinical children of all ages, especially in children with chronic cough, acute attacks of asthma and acute laryngitis with remarkable efficacy. At present, the main small volume nebulizer inhalation devices are jet nebulizer and ultrasonic nebulizer, jet nebulizer aerosol particles are smaller, about 0.5-5um, can directly reach the lower respiratory tract and alveoli, but the noise is relatively ultrasonic nebulizer, so the compliance of the jet nebulizer is relatively poor. 1, the current commonly used nebulized inhalation drugs (1) glucocorticoids: commonly used drugs for budesonide suspension, is a strong glucocorticoid activity and weak salt corticosteroid activity of anti-inflammatory corticosteroids. It can inhibit allergic or non-allergic inflammation involving various cell types (such as mast cells, eosinophils, neutrophils, macrophages and lymphocytes) and mediating factors (such as histamine, arachidonic acid, leukotrienes and cytokines). It is mainly used for the treatment of bronchial asthma, capillary bronchitis, acute laryngotracheal bronchitis, bronchopulmonary dysplasia, and occlusive capillary bronchitis. (2) Bronchodilators: commonly used drugs are fast-acting β2 agonists, such as salbutamol and terbutaline, which can selectively act on the β2 receptors of bronchial smooth muscle to expand the bronchus to relieve spasm and stenosis. Because of their selective action, they have relatively little effect on heart rate. In addition, more commonly used anticholinergic drugs such as ipratropium bromide, an M-receptor antagonist, act locally on muscarinic receptors in bronchial smooth muscle, causing an increase in intracellular cGMP and diastole the bronchial smooth muscle. Combined application with β agonists can enhance its bronchodilator effect. (3) Mucolytic agents: commonly used drugs are amiloride hydrochloride and acetylcysteine. Ambroxol can promote the elimination of mucous secretions in the respiratory tract and reduce the retention of mucus, thus promoting the elimination of sputum and improving the respiratory condition. Acetylcysteine can break the disulfide bonds between mucin molecular complexes, reduce the viscosity of sputum and make sputum easy to cough up. 2.Commonly used nebulized drugs (1) acute asthma attack: salbutamol solution + ipratropium bromide + budesonide suspension for inhalation (2) capillary bronchitis: salbutamol solution + budesonide suspension for inhalation (3) acute laryngitis: budesonide suspension (4) phlegm: acetylcysteine solution for inhalation 3.Care (1) indoor environment: suitable temperature and humidity can reduce the discomfort of children and increase their compliance. (1) Indoor environment: appropriate temperature and humidity can reduce the discomfort of the child and increase his or her compliance. The ideal ambient temperature is 18-20℃ and relative humidity is 50-60%. (2) Appropriate position: Gently lift the jaw upward to fully open the airway, which can reduce the retention of drugs in the oropharynx and promote better entry of drug particles into the lower respiratory tract. (3) Crying and irritable children should be soothed, and it is best to let the child perform nebulized inhalation under quiet conditions. If possible, the clinic should be equipped with children’s channels or cartoons and simple toys to divert the child’s attention so that the treatment can proceed smoothly. (4) The maximum time of treatment is 30 minutes before or 2 hours after meals to avoid vomiting caused by the nausea reflex caused by the medicine stimulating the throat. (5) Clear the nasal cavity before nebulization to ensure smooth inhalation of the medicine. After nebulization, back snapping and sputum patting can be performed, with hollow palm from outside to inside and from bottom to top with even force. Washing and gargling after treatment can reduce the adverse reactions such as hoarseness and facial dermatitis brought by glucocorticoids. Avoid applying oily skin care products when applying budesonide to prevent the occurrence of lipid pneumonia.