The treatment of children with fever of 40 ℃ is as follows: immediately use pediatric ibuprofen suppositories anal plugs for children to lower the temperature, pay attention to unclothing the child, keep the room ventilated, so that the heat in the child’s body to better disseminate, helping to lower the temperature, so that the child to drink more boiled water, you can also drink freshly squeezed juices containing vitamin C is rich in, such as apple juice, orange juice and so on, to help improve the child’s immunity, help to recover from illness, and help the child. This will help to improve the immunity of the child and help the recovery of the disease. Since fever in children is usually caused by a viral infection in the body, taking antiviral medication may help. Oseltamivir is most effective if a flu virus infection is suspected.