2. Rapid rewarming: as soon as possible to make the casualty out of the cold environment, if the conditions, should be immediately warm water rapid rewarming, rewarming in the warmth of the conditions of adequate evacuation. If there are no conditions for rapid rewarming, the casualty should be evacuated as soon as possible, and attention should be paid to keeping warm and preventing trauma during the evacuation. Rapid rewarming in warm water should be carried out immediately after arriving at the medical unit. Especially for the treatment of frostbite which is still in the freezing state of two, three, degree, rapid rewarming is a significant effect and key measures. Specific method: the frozen limbs immersed in 42 ℃ (should not be too high) warm water, to the frozen area of the skin turns red, especially the finger (toe) nail bed redness, tissue softening until, time should not be too long. For facial frostbite, a towel can be moistened with 42 ℃ warm water for localized hot compresses. In the absence of warm water, the frozen limb can be immediately placed on its own or the rescuer's warm body parts, such as armpits, abdomen or chest, in order to achieve the purpose of rewarming. It is strictly prohibited to rescue the fire, snow rubbing, cold water immersion or pounding the affected area.