Sputum chemotherapy for children can be divided into three types: oral, nebulized inhalation, and intravenous, with different characteristics, depending on the way of intake. If children need to take medicine because of their weight and disease differences, it is recommended to consult a professional doctor and carry out medication according to the specific situation.1. Oral phlegmolytic drugs: Aminobroxol hydrochloride oral solution, Aminobroxol oral solution and other preparations containing Aminobroxol ingredients can dilute phlegm and promote the discharge of phlegm, which has a better effect on phlegm. Drugs such as Lung Power Cough Combination, Compound Fresh Bamboo Liqueur or Fresh Bamboo Liqueur are more effective in the treatment of yellow pus sputum caused by bacterial infection. Mucolytic agents such as acetylcysteine, carboxymethylstilbestrol, and eucalyptus pinene enteric soft capsule have better mucolytic effect and can be used for the treatment of children with thicker sputum. Orange Red Granules and Antelope Cough Syrup have the effect of relieving cough, calming asthma and resolving phlegm, and can be used to treat sputum and cough. Snake Bile and Chen Pi Oral Liquid can be used for treating wind-cold cough, phlegm and erratic cough. 2. Nebulized inhalation phlegmolytic drugs: Ambroxol hydrochloride, budesonide, terbutaline sulfate, etc. These drugs can be inhaled by the respiratory tract through high speed oxygen airflow to form a mist of medicine for the purpose of treatment. It can be used to treat respiratory tract infection, with the effect of diluting sputum, helping expectoration, eliminating inflammation and edema; 3. Intravenous phlegmolytic drugs: including Ambroxol and Bromhexine, which have good effect of dissolving mucous sputum and lubricating respiratory tract.