Acute gastroenteritis fever 39℃, usually caused by food poisoning or infection, it is recommended to promptly choose a regular hospital for consultation, perfect examination and take symptomatic treatment to avoid aggravation of the disease. I. Improve the examination: when you find a fever of 39 ℃ persistently high fever does not go down, you should first go to the hospital to improve the blood culture, stool culture and stool routine and other tests, combined with the food eaten recently, to identify the causative microorganisms, to clarify the cause of the disease. Second, control the infection: according to the results of drug sensitivity test, follow the doctor’s instructions to choose targeted antibiotic treatment, such as norfloxacin, gentamicin and other anti-infective treatment, so as to control inflammation. Symptomatic medication: 1, rehydration: those with high fever and sweating need to be alert to the occurrence of dehydration, oral rehydration salts or intravenous rehydration can be given according to the situation to prevent water and electrolyte disorders; 2, antispasmodic and analgesic: those with severe abdominal pain can apply atropine, compound belladonna tablets to relieve pain; 3, anti-vomiting, anti-diarrhea: can apply montelukast, metoclopramide, etc. to relieve the symptoms of vomiting and diarrhea; 4, physical methods: can Apply ice packs or wipe the body with cool water or alcohol, using liquid evaporation to take away the heat of the body, so as to achieve the purpose of cooling, or use antipyretic patches, etc. can also achieve the same effect; 5, other: if identified as caused by food poisoning, if necessary, gastric lavage can be used to minimize the intake of toxic substances, but also under the guidance of doctors to apply the corresponding detoxification drugs. It is recommended to improve the daily diet structure, mainly light and easy to digest diet, such as rice porridge, eat more fruits and vegetables, maintain a regular diet, do less and more meals, forbid to eat cold, hard, spicy, stimulating and unclean food to avoid causing intestinal infections, and if symptoms such as vomiting and diarrhea appear, it is recommended to fast and go to the hospital in time.