Diet therapy for chronic renal failure is a very important part. It can reduce nitrogenous metabolites, reduce the burden on the kidneys, and also reduce the stimulation of toxins, reduce clinical symptoms and delay the deterioration of renal function. The main measures of dietary therapy are as follows: 1. Give a high quality low protein diet of 0.6-0.8 g/(kg body weight/day), vitamin-rich diet, such as eggs, milk and lean meat and other high quality proteins. Low-protein diet plus essential amino acids or alpha-keto acid therapy. When applying alpha-keto acid therapy, pay attention to review the blood calcium concentration, and use cautiously in hypercalcemia. In the absence of severe hypertension and obvious edema, urine volume >1000ml/day, salt 2~4g/day. 2. Calories and carbohydrates should be sufficient. Patients must consume sufficient amount of calories, generally 30~35 kcal/(kg body weight・day). If necessary, the staple food can be wheat starch with vegetable protein removed. The source of calories is provided by carbohydrates and a moderate amount of fat (75% and 20%, respectively). Refined starches and monosaccharides and disaccharides are suitable. For example, wheat starch, lotus root flour, water chestnuts, vermicelli, vermicelli and cold noodles are low in protein, especially wheat starch is the best, which has a very low protein content and can be made into noodles, pancakes, pies, buns, hair pudding, hot dumplings and other food. Other things like potatoes, taro, carrots, pumpkins and roots also contain less protein than rice, flour and corn. 3, water and electrolytes appropriate. If you do not have hypertension and swelling, you can eat a low-salt diet, with no more than 1 to 2 grams of salt per day for cooking, and water does not need to be strictly limited. If there is hypertension and swelling, the sodium limit should be below 25 mg per kg of body weight, and the water limit can be decided according to the amount of urine and sweating throughout the day. In children with mild renal insufficiency, potassium intake does not need to be strictly limited. When the disease is serious and the urine volume is very little, the limit should be appropriate, and some foods with low potassium can be chosen. 4, limit the intake of phosphorus. Children with chronic renal insufficiency often have high blood phosphorus and low blood calcium, which will inevitably affect the development of bones and cause renal rickets if it continues. Therefore, early attention should be paid to limiting the intake of phosphorus in the diet. Milk and dairy products, lean meat and beans are rich in phosphorus and should not be eaten in excess. In addition, some calcium tablets, such as calcium carbonate, calcium lactate or calcium gluconate (calcium content of 40%, 12% and 8% respectively) can be supplemented. Calcium chloride is acidic and is not suitable. 5. Other. Chronic renal insufficiency is often combined with anemia, due to various dietary restrictions, the hematopoietic material often can not meet the needs, must additionally take folic acid, vitamin B, vitamin D and iron. Diet should be easy to digest, less crude fiber to reduce the stimulation of the gastrointestinal tract.