Children with a fever of 40 degrees should be given antipyretics as well as physical cooling, identify the cause and provide targeted treatment to avoid recurring temperatures. Prompt medical attention is recommended to reduce fever and avoid neurological damage. You can use commonly used antipyretic drugs, such as ibuprofen or acetaminophen, under the guidance of a doctor, with an interval of four to six hours between antipyretic drugs. And with physical cooling, such as using warm water to wipe the roots of the thighs, armpits or neck or apply fever-reducing patches, and to give timely hydration is conducive to fever reduction. And promptly go to the blood test blood routine, clear infection pathogen type, according to the blood routine results clearly is a viral, bacterial infection, give the appropriate anti-inflammatory drugs, in order to from the root of the treatment, to prevent the temperature recurrence.