The most common cause of fever and vomiting in children is acute gastroenteritis. In addition to water and food fasting, children need to be given medication to protect their stomach. In addition, if the vomiting is severe, medication to relieve vomiting, such as morpholine suspension, is also needed. If the temperature exceeds 38.5 degrees, the child should be treated with antipyretic drugs such as ibuprofen suspension and acetaminophen pellets, which can be repeated once after an interval of 4-6 hours, no more than four times a day. In addition, the cause of persistent fever with vomiting in children is likely to be viral encephalitis, clinical need to do lumbar puncture and EEG examination to clarify the diagnosis, if there are abnormalities in the EEG, viral encephalitis requires early hospitalization, clinical need to give antiviral treatment and comprehensive treatment.