Fever refers to the direct action of the pyrogen on the thermoregulatory center, dysfunction of the thermoregulatory center or excessive heat production and low heat dissipation caused by various reasons, resulting in an increase in body temperature above the normal range. Low fever: 37.3 ℃ to 38 ℃, medium-low fever: 38 ℃ to 39.0 ℃, high fever 39 ℃ to 40 ℃, different temperatures, different ways to reduce fever. Low fever: with physical cooling, with a warm towel to wipe the armpits, forehead, groin, wipe continuously for ten minutes, repeated at intervals of half an hour; home ambient temperature of 28 to 29 degrees Celsius, can be combined with a warm bath; can not be scrubbed with alcohol, small children with a large surface area, it is easy to develop symptoms of alcohol poisoning. Medium-low fever: if the child’s mental state at this time is good, can be the above low fever treatment, if the mental state is not good, accompanied by chills, drowsiness, should be combined with the rubbing of hot palms, feet, and at the same time to give antipyretic drugs to deal with, such as ibuprofen or acetaminophen antipyretic drugs. High fever: first promptly give antipyretic medication, and feed more warm water after taking the medication to help sweat out the fever. Fever is a symptom of many diseases in children, and it is important to identify the triggering factors, conduct relevant examinations, and treat the cause of the disease before the body temperature can return to normal.