(1) Providing high-quality protein: Patients with acute renal failure in oliguria period have poor appetite, so it is difficult to meet the requirement of high calorie. If the illness is mild, the heat supply should be mainly digestible carbohydrates. You can choose fruits, wheat starch noodles, cereals, biscuits or other wheat starch snacks, and add a small amount of rice soup or gruel to reduce the intake of protein and non-essential amino acids, reduce the burden on the kidneys and prevent the aggravation of nitrogen retention. Protein should give animal protein as much as possible, adopt the principle of high raw material price and low protein, and determine the daily protein amount according to the situation of urea nitrogen. Appropriate amount of animal protein such as lean meat, fish, chicken and shrimp can be used alternately to adjust the taste of patients. \x0d\(2) Limit water intake: During oliguria, strictly limit the intake of various kinds of water to prevent excessive body fluids from causing acute pulmonary edema or diluted hyponatremia. To calculate the water content of food, such as 1g protein raw water 0.43ml, 1g fat raw water/kloc-0 1.07ml and 1g carbohydrate raw water 0.55ml, it is necessary to record the drinking water and urine volume, and determine the daily intake according to the discharged body fluids. In general, you should drink water according to your doctor's advice. \x0d\(3) Provide a low-salt and low-sodium diet: Oliguria is often accompanied by edema, and a low-salt, salt-free or low-sodium diet should be adopted according to the determination of blood sodium. \x0d\(4) Hyperkalemia: Reduce the amount of potassium in the diet and avoid foods containing potassium, so as to avoid the increase of exogenous potassium and aggravate hyperkalemia. Foods with high potassium content can be frozen, soaked in water or discarded to reduce potassium content. \x0d\(5) If the patient can get better in a short time, the patient should be given a low-protein diet, and those with severe gastrointestinal reaction should be given intravenous rehydration in a short time, mainly glucose. \x0d\(6) During the polyuria period, urine output increased, blood urea nitrogen decreased and appetite improved day by day. Proper nutrition increase can accelerate the repair of the body. During the period of polyuria, attention should be paid to supplementing water and electrolytes, and drinking water every day is about 1000 ml. When intravenous rehydration is used, the urine volume of the previous day should be calculated. Attention should be paid to the administration of vitamin preparations. \x0d\(7) During the recovery period, serum creatinine and blood urea nitrogen gradually decrease, and at the same time, dietary protein can be gradually increased, and amino acid injection can be given if necessary. Amino acid injection contains isoleucine, leucine, lysine, methionine, valine, arginine, histidine and so on. It is worth noting that branched-chain amino acids should account for 40% ~ 50% of essential amino acids, which is beneficial to the synthesis of muscle protein. \x0d\(8) Acute renal failure: Avoid irritating food, such as wine, coffee and pepper.