Children with fever and dry cough can be examined for routine blood tests, C-reactive protein and chest X-ray. Through blood and image analysis, if the peripheral white blood cell count is normal or low, neutrophils are low, and lymphocytes are elevated, the fever and cough are mostly caused by viral infections, and antiviral medications can be given to treat the symptoms. If the peripheral white blood cell count is elevated, neutrophils are elevated, for bacterial infection caused by fever and cough, antibiotic drugs can be used for symptomatic treatment, the child needs to drink a lot of water, pay attention to rest, vitamin C supplementation, to prevent cross-infection.