Fever is a compensatory response due to the body’s defense against disease and abnormal temperature of the internal and external environment. A fever of 40℃ in a one-year-old child is considered high fever because the young child does not yet have a sound thermoregulatory function, and persistent high fever seriously threatens the life safety of the young child. Active cooling measures should be taken to control the body temperature, such as physical cooling, medication cooling, and symptomatic treatment. A, the measures to reduce fever 1, physical cooling is the preferred method, belongs to the physiological category, body heat through the conduction and distribution, with the advantages of easy to implement, safe and effective. It includes the following: (1) warm water bath: put half a tub of hot water with a water temperature lower than the child’s body temperature of 1 ℃, that is, 39 ℃, take off the child’s clothes, gently put the child into the tub and soak the whole body except the head for 5-10 minutes. After soaking, use a large towel to quickly dry the whole body and put on the clothes; (2) warm water bath: the child’s body surface, the large blood vessels of the walking parts, wipe with 32-36 ℃ of warm water, wipe the process of massage to the baby, in order to speed up the expansion of blood vessels, to play the role of heat dissipation. Do not exceed 20 minutes, after the bath with a towel to dry the skin, change the child’s clothes and cover the quilt. 2, drug cooling: can selectively use ibuprofen, acetaminophen; 3, pathogenic treatment: should do the relevant examination, early diagnosis to find the source of the disease, take targeted treatment. Second, the cooling process considerations 1, grasp the timely and correct timing of cooling. The child will have the manifestation of malignant cold, poor circulation of nerve endings and cold hands and feet during the fever period, which is not suitable for physical cooling method; 2. Choose the correct bathing site. The armpit, elbow fossa and groin are the traveled parts of the body blood vessels, and should stay more in the above parts when performing physical cooling. It is forbidden to wipe the back of the occiput, the front chest, the abdomen and under the feet, etc.; 3. Closely observe the changes in the child’s face, breathing, pulse and heart rate when taking the bath, and stop cooling immediately when chills and shivering occur.