Children with a fever of 40 degrees need to be timely cooling treatment, generally through timely cooling, physical cooling, medication and other ways to deal with. Secondly, you need to take the child to the hospital in time to find out the cause of the disease to do targeted treatment. 1. Timely cooling: children with a fever of 40 degrees need to loosen the clothes in a timely manner, do not use too thick clothing or quilt wrapped to prevent the impact of heat dissipation, aggravate the condition. 2. Physical cooling: children with a fever of 40 degrees can use lukewarm water to wipe the body before the doctor’s office to help the body cool down. 3. medication: you can use acetaminophen, ibuprofen and other antipyretic drugs to reduce body temperature. 4. Timely medical treatment: children with a fever of 40 degrees parents should pay attention to, timely take the child to the hospital to identify the cause of fever, do targeted treatment. All of the above medications should be used under the guidance of a doctor to avoid self-medication.