A fever of 39℃ in a 10-year-old child is considered to be caused by acute respiratory tract infection and other factors. First of all, physical cooling can be given by scrubbing the forehead, neck, armpits, popliteal fossa, leg roots and other parts rich in blood vessels with warm water to help dissipate heat. At the same time, appropriate medication can be given to reduce fever, such as ibuprofen pellets, pediatric fever suppositories, and pediatric aminoglutethimide pellets for treatment. In addition, if the child also has coughing, coughing and other respiratory tract infection symptoms, it can be treated with cefaclor granules, strong lozenges and other medications. If oral medication is not effective, it is recommended to go to the hospital for blood sedimentation tests, routine blood tests, chest radiographs and routine urine tests to further clarify the cause of the fever, and then choose anti-infection treatment by infusion as well as with antipyretic and analgesic preparations for active treatment. During the fever period, pay attention to more rest and do not overexert yourself.