The clinical methods of physical fever reduction include two kinds, local cold therapy and whole-body cold therapy. Patients with fever of 40℃ belong to high fever, at this time, the choice of local cold therapy method is not obvious to reduce fever, it is recommended to choose whole body cold therapy, warm water swabbing bath, ethanol swabbing bath can be used to achieve the purpose of cooling. 1, prepare 32-34 ℃ warm water, or 25%-35% concentration of ethanol. 2, ethanol swabbing bath, you can put the ice bag on the head to help cool down and prevent head congestion and headache; hot water bag placed on the bottom of the foot to promote vasodilation and reduce head congestion, and make the patient feel comfortable. 3, wipe order (1) double upper limbs: lateral neck – shoulder – shoulder upper arm lateral – forearm lateral – back of the hand; lateral chest – axilla – upper arm medial – forearm medial – palm; (2) lower back: under the neck shoulder – buttocks; (3) double lower limbs: iliac bone – lower limb lateral – back of the foot; groin – lower limb medial – inner ankle; under the hip – posterior thigh – popliteal fossa – heel. 4.Wiping time: 3 minutes per side (extremities, waist and back), within 20 minutes for the whole process; 5.Observe whether the patient has chills, pale face, abnormal pulse and breathing, if abnormal, stop swabbing and deal with it in time.