Inhaled medications are the most common treatment for asthma in children and are usually given after an outpatient visit to a pediatric asthma clinic. We are all familiar with the use of oral medications, intramuscular medications and intravenous medications, but we are still relatively new to inhaling medications through the respiratory tract. Our lungs are open organs, which keep the body exchanging oxygen and carbon dioxide with the outside world. The total number of alveoli in each side of a person’s lung reaches 280×10*6, with a total area of about 50-100m*2, which is approximately equivalent to the area of a blue court and comparable to the area of the intestinal mucosa. Therefore, drug administration by inhalation has a wide absorption space as well as oral administration. Moreover, there are various receptors and receptors in the mucous membrane and submucous membrane of the respiratory tract, and the drug inhaled from the airway can act directly on these receptors and receptors, which can achieve the therapeutic effect quickly and effectively. The efficacy of inhaled drug delivery depends largely on the amount of inhaled drug deposited in the lungs, and drugs inhaled from the airways are deposited in the lungs and airways by inertial deposition, gravitational deposition, and diffusive deposition. The unique metabolic kinetics of inhaled drugs facilitate their local action, and because inhaled drugs act directly on target receptors in the submucosa of the bronchi, the dose of inhaled drugs required is much less than that of oral and injectable drugs, because the doses used are small and cause minimal side effects. There are two types of inhalation drugs commonly used in children with asthma: 1, pressure quantitative aerosol inhaler such as fluticasone propionate aerosol, budesonide and salbutamol aerosol, MDI is the most commonly used drug for asthma inhalation treatment, only a snap of the hand can spray a fixed amount of liquid. If the hand-lung action cannot be coordinated, it is difficult to inhale the intended amount of medication. Usually, children over 4 years old can master the medication method correctly only through repeated education, and children under 4 years old should be assisted with the inhalation of the storage tank. 2, dry powder inhalation such as formoterol/budesonide and fluticasone propionate/salmeterol dry powder inhaler, DPI is a new type of inhalation device developed after MDI for the treatment of asthma, which does not contain a projectile, and the concentration of the drug inhaled into the lungs is about 10%-30%, slightly higher than MDI, as long as it can cooperate with It is suitable for all patients who can cooperate with inhalation, and children over 4 years old can usually master the correct use after repeated education. Since the dry powder inhalation drug is ICS+LABA, its efficacy is better and side effects are less, which can greatly improve the level of asthma control, and it is the drug of choice for asthma in older children, and the use of ICS+LABA to treat asthma in children is a sign of the level of treatment. It is important to note that when using formoterol/budesonide dry powder, the drug is loaded when a “click” is heard after rotation, so do not rotate it again. As the drug use “scale” is displayed every 10 times, when the red mark appears, to determine whether there is still drug, you need to rotate until the sound appears, and the drug outlet is gently “drummed” against the black (or dark) paper or table, if there is white drug appears, it means If white medication appears, the medication is still there and can be used. Since children are mostly given inhalation medication for asthma, and they need to be taught and practiced repeatedly to master the correct method of use, this puts higher demands on our asthma specialists, who must personally teach the children and their parents the correct method, and must check whether the method of use is correct when the children are seen again, so as to ensure effective treatment of the disease.