Physical hypothermia is a safe and effective cooling measure that can be used repeatedly. It can be used in the early home care of children with high fever or a history of febrile convulsions. There are several methods: 1, head cold compress or pillow ice bag head cold compress: cold towel on the head, to be replaced after the towel becomes warm. Pillow ice bag method: place an ice bag on the forehead or pillow on the back of the head. If there is no ice bag can be put into a warm water bag or plastic bag, if the situation is urgent or no conditions can also be used instead of popsicles. Note: the ice bag and the skin with a towel or handkerchief separated, so as to avoid discomfort or local tissue frostbite. Chest and abdomen can not be put in ice bags to prevent heart rate slowdown or diarrhea. 2.Warm bath: Close the doors and windows, no convection wind or direct blowing wind, room temperature between 24 ℃ ~ 26 ℃. The water temperature should be 1 ℃ lower than the body temperature, the amount of water to not to the torso is appropriate. Hold up the child’s head and shoulders, the body lying in the basin, the time to 5-10 minutes is appropriate. Note: The water temperature should not be too hot or too cold, the bath should be stirred away from the child when you need to add water, heavy or mental, facial and respiratory conditions are not good when the temperature of the bath is prohibited, the bath should be stopped when abnormal conditions. 3, towel wet compress: about 30 ℃ warm water wet large towel wrapped around the child’s body, only the face and feet, for about 10 minutes. 4, alcohol bath: about 30% alcohol, wet with square yarn, according to the direction of the whole body as follows: upper limbs: the side of the axilla → upper arm lateral → arm: lateral chest → axilla → upper arm medial → palm: lower limbs: one side of the hip → thigh lateral → foot back: groin → thigh medial → N fossa → heel. 5, Note: (1) chest and abdomen are not rubbed to avoid slowing down the heart rate or diarrhea; alcohol bath for newborns should be carried out under the guidance of a doctor. (2) will rub the skin until red is appropriate; no alcohol available white wine with warm water instead. (3) alcohol baths should be gentle, do not rub the skin.