Flaccid fever is also known as septic fever. It is a condition in which the body temperature is often above 39 degrees, fluctuates widely, and the range of fluctuation is more than 1℃ in 24 hours, but the lowest body temperature is still higher than the normal body temperature. Commonly seen in sepsis, septic inflammation, severe tuberculosis, Kawasaki disease, advanced tumors, malignant histiocytosis, etc. 1.It is advisable to eat foods with cold taste; 2.It is advisable to eat foods with high vitamin; 3.It is advisable to eat easily digestible liquid or soft food. At the same time, winter should pay attention to the cold and warmth, in the hot and cold climate change at any time to increase or decrease clothing, avoid cold and rain and excessive fatigue. Strengthen physical exercise to enhance their resistance and adaptability to the natural environment. Drink plain water, autumn and winter dry climate, the human body is prone to water shortages, often drink plain water, not only to ensure that the human body needs, but also can play a diuretic detoxification, the elimination of body waste effect.