Compared with adults, children’s respiratory system is not yet well developed, and phlegm is easily blocked in the pharynx and trachea. Due to their young age, they may not be able to cough out the phlegm well, and they can usually gradually relieve the discomfort and promote the expulsion of phlegm by drinking water, patting the back, or treating the symptoms through nebulization or oral medication. I. Drinking water: Because the rapid airflow produced when coughing up sputum in children may take away the water in the mucous membrane of the respiratory tract, thus leading to dehydration, which may cause the secretion to become too sticky, resulting in sputum not being easy to cough up. When the phlegm in the throat is less and thinner, drinking a certain amount of warm water or cool boiled water appropriately has a certain effect of diluting phlegm, which is conducive to coughing up the phlegm. Second, patting the back: in the children’s coughing gap, let them lie on the parents’ shoulders or thighs, parents will be slightly bent fingers, in the form of empty palms, from the bottom to the top, from the outside to the inside, patting the children’s back, prompting phlegm out of the throat. Nebulization therapy: Through nebulizing devices, drugs such as Ambroxol and acetylcysteine are dispersed into smaller particles and inhaled into the respiratory tract or lungs, which has a certain effect of removing phlegm. Fourth, oral drug therapy: 1, expectorant drugs: such as Ambroxol, Ambroterol, Bromhexine and other drugs, usually can change the viscous component of sputum, so that the viscosity of sputum is reduced, and it is easy to cough out the sputum; 2, phlegm removing drugs: such as children’s lung heat cough and asthma particles, which has ephedra, licorice and other drugs, usually has a certain cough, expectorant effect; 3, antibiotics: such as cefoperazone, amoxicillin, etc., can Improve the phlegm caused by bacterial infection; 4, other drugs: such as ribavirin spray, belongs to the broad-spectrum antiviral drugs, for viral upper respiratory tract infections produced by coughing, coughing up phlegm, has a certain effect. E. Other treatments: you can also eat Chuanbei stewed avocado, radish soup and other foods, Chinese medicine believes that its nature of the cool, with a certain cough, moisten the lungs, phlegm effect.