Three-year-old children with recurrent high fever first need to be reasonable antipyretic symptomatic treatment, and to clarify the causes of fever and treatment of the cause. Fever is a common symptom of childhood, normal body temperature is generally 36 ~ 37 ℃, such as just an individual temperature of 37.4 ℃, the general condition is good, and there is no self-conscious symptoms, is not sick. 37.5 ~ 38 ℃ for low fever, 38.1 ~ 38.9 ℃ for moderate fever, 39 ~ 41 ℃ for high fever, ≥ 41 ℃ for ultra-high fever. For children with recurrent high fever, while using ibuprofen and acetaminophen as prescribed by the doctor for medication to reduce fever, they should actively use physical methods such as applying warm water to their foreheads and reducing the amount of clothing they wear to lower their temperatures. Encourage the child to drink more water. It is also important to treat the cause of fever. For respiratory tract infections caused by bacterial infections, antibacterial drugs such as cefaclor and cefdinir should be actively used to fight infection. In case of Kawasaki disease, intravenous immunoglobulin and oral aspirin are needed; in case of hematological tumor-related diseases, chemotherapy and bone marrow transplantation are needed. These medications should be used under the supervision of a physician, and self-medication should be avoided. High fever in children can be seen in a variety of diseases, and it is recommended to actively consult a specialist for evaluation and treatment.