Body temperature of 40 ℃ is high fever. If the child if the body temperature of 40 ℃, it is recommended to take oral ibuprofen suspension or anal application of indomethacin suppositories to lower the temperature of treatment in a timely manner, so as to avoid high fever caused by convulsions. Monitoring changes in body temperature should be noted that antipyretic is only treating the symptoms but not the root cause of the disease itself, but also need to be combined with the presence of coughing, coughing sputum, chest tightness, asthma, nasal congestion, runny nose and other symptoms, chest X-ray, blood, CRP, calcitoninogen and other tests to understand the fecal situation as well as the degree of inflammation, to find out the cause of the fever, the cause of the disease for the treatment. Children should take rest and drink plenty of water to avoid dehydration caused by high fever. Closely observe the mental condition and diet of the child.