Children with sputum in the lungs, mostly related to infections, such as bronchitis, bronchopneumonia, mycoplasma pneumonia, bronchiectasis, etc., to go to the hospital to take a chest radiograph or do a CT of the lungs, laboratory tests of blood, C-reactive protein, Mycoplasma pneumoniae and so on to further clarify the diagnosis, and to give anti-inflammatory treatments, such as ceftriaxone, azithromycin, and other anti-inflammatory treatments. At the same time, with acetylcysteine nebulized inhalation to assist in sputum expulsion, oral aminoglutethimide oral solution, chicken bile oral solution and other sputum treatment. Sputum culture and drug sensitivity test can also be done to choose sensitive antibiotic treatment. If the diagnosis of mycoplasma pneumonia is confirmed, the treatment must be standardized. If the treatment time is short and the inflammation is not completely absorbed, the condition will be easy to recur and there will always be sputum in the lungs.