If you cough up yellow-green sputum, you should consider the combination of bacterial infection, and further improve the sputum culture examination, and draw blood to test inflammatory indexes such as routine blood test, C-reactive protein and calcitoninogen. If the above inflammatory indexes are higher than the normal value, it indicates the combination of bacterial infection, and anti-infective treatment with sensitive antibacterial drugs should be selected according to the results of sputum culture. In addition to active anti-infection treatment, oral cough suppressant and phlegm-relieving drugs can also be taken. Food therapy can be used, such as drinking ice sugar snow pear water or Chuanbei loquat paste to stop coughing and resolve phlegm. Pay attention to drink more warm water, eat a light diet, avoid spicy and stimulating food, and pay attention to rest and do not stay up late.