When a child has a fever with gastroenteritis, systemic treatment as well as symptomatic treatment should be used according to the specific situation of the child, as follows: 1. If the fever is caused by digestive weakness and indigestion, systemic treatment is mainly carried out by taking digestive drugs, such as pepsin and gastrointestinal tablets. At the same time, the child can also take probiotics to regulate the gastrointestinal flora and relieve the symptoms of gastroenteritis. If the fever is caused by gastrointestinal infection virus, or bacteria, we should consider the antiviral ribavirin, or antibiotic amoxicillin pellets for treatment; 2. If the body temperature is below 38.5 degrees, you can reduce the fever by physical cooling, such as using a cooling patch or taking a warm bath, if the body temperature is higher than 38.5 degrees, you can take ibuprofen pellets to reduce the fever; 3. If the diarrhea and vomiting are more obvious, also pay attention to rehydration to avoid dehydration.