Before the trauma surface is healed, burn patients are in a negative nitrogen balance due to exudation from the trauma surface, high daily evaporation of water, serious protein loss, and high heat consumption. If the consumption is greater due to complications such as infection and surgery, patients with severe burns can lose 1 to 2 kg or more of body weight daily. Patients with more than 60% of burn area need more than 180 g of protein daily to maintain nitrogen balance. However, in the early stage of burns, excessive protein intake often causes gastrointestinal dysfunction in patients, and the more it is supplemented, the more nitrogen is excreted, which in turn increases the burden on the stomach, intestines, liver and kidneys, so the nutritional supplementation focuses on calories, and the daily supply of calories is appropriate at 50-60 kcal per kg of body weight. Protein supply should be 1.5-2g per kg of body weight per day, gradually increasing to 2.5g. The main purpose of protein is to participate in the renewal of cellular components, repair trauma and improve the immune function of the body; protein supplementation in food is not only economical but also balanced in terms of nutrients. The protein supplementation in food should be mainly animal protein, accounting for about 70%, but if the patient has poor gastric function and the blood non-protein nitrogen is elevated, the protein intake should be reduced appropriately.