Physical hypothermia is a common clinical method of cooling, including local and systemic hypothermia, which is applicable to both adults and children. Body temperature over 39 ℃, the choice of local cooling, cold towels, ice packs, fever patches, etc., through the conduction mode of heat dissipation; body temperature over 39.5 ℃, the choice of systemic cooling, can be used to warm water swabbing, ethanol swabbing, etc., to achieve the purpose of cooling. Local cooling methods are as follows: 1, cold towels, ice packs, antipyretic patches, etc., placed on the patient’s forehead, the top of the head and the surface of the large blood vessels flow through the place, such as the sides of the neck, armpits, groin, etc.; 2, if the use of ice packs cold compresses on the forehead, should avoid ice packs are too heavy, in order to reduce the local pressure, but the ice packs must be in contact with the forehead skin; 3, if the use of cold towels cold and wet compresses, the towel should be replaced once every 3-5 minutes. Whole body cooling methods are as follows: 1, using ethanol swabbing, can be placed in the head of the ice bag to help cool down, while preventing head congestion and headache; hot water bag placed on the soles of the feet to promote vasodilation of the soles of the feet to reduce head congestion, so that the patient feels comfortable; 2, regardless of whether it is a warm water swabbing, ethanol swabbing, should be swabbed with the direction of centrifugal swabbing, swabbing and bathing, and then immediately after the drying of the skin with a towel.