3-year-old children with a fever of 38.5 ℃ or more, first of all, the timely application of drugs to reduce fever (ibuprofen, etc.) combined with physical cooling (warm water baths, etc.), and at the same time, should actively find out the causes of fever, and for the cause of the drug treatment. 3-year-old children with a fever of 38.5 ℃ or more, should be timely antipyretic drugs, commonly used drugs, including ibuprofen, acetaminophen, you can choose to give the drug orally, you can also choose to give the drug rectally; and combined with the physical fever, such as warm water baths, cold towels on the forehead, paste fever patches, etc., in order to achieve a good effect of fever reduction. Fever is a symptomatic manifestation of disease, and the cause of fever should be actively searched for and treated according to the cause. If the fever is caused by a bacterial infection, antibacterial treatment is needed, such as amoxicillin and antibiotics such as cefdinir under the guidance of a doctor. In the case of viral infections, since the virus is self-limiting and the duration of the illness usually does not exceed one week, no special treatment is needed, only symptomatic treatment can be given, and antiviral drugs (such as oseltamivir phosphate) can be given if necessary. 3-year-old children with symptoms of fever, you need to take the child to the hospital, under the guidance of the doctor’s medication.