1, intake of high quality protein The protein intake of patients with chronic renal failure should be reasonably adjusted according to the degree of renal function damage. When entering CKD stage 3, appropriate protein restriction (0.6g/kg) should be carried out, which can meet the basic physiological needs of the body without malnutrition. After entering CKD4, the daily protein intake should be strictly limited to 0.4g/kg, and more than 60% should be high quality protein, i.e. animal protein with essential amino acids. Animal protein has a higher content of essential amino acids than vegetable protein, and has a higher utilization rate of human protein and produces less metabolic waste. Such as eggs, milk, lean meat, etc. 2.Take enough calories Patients should take in sufficient carbohydrates and fats to supply the body with enough calories to prevent the protein from decomposing to provide heat and reduce the consumption of protein. Ensuring sufficient calories is the guarantee to achieve long-term low protein diet. Daily intake is 30-35 kcal/kg body weight. More margarine, vegetable oil and table sugar can be consumed. Food should be rich in vitamin B, C and folic acid. 3, reduce the intake of sodium less or not to eat salted vegetables, curd, eggs, soy sauce, MSG and other foods containing high sodium, without the above cases of salt can be appropriate into 4-6g / d. 4, limit the intake of potassium ions because potassium ions can not be excreted by the damaged kidneys, will cause “hyperkalemia”, can induce a variety of cardiac arrhythmia, serious cases Ventricular fibrillation, cardiac arrest. Avoid foods high in potassium, such as vegetables, fruits, nuts, potatoes, mushrooms, cocoa, chocolate, etc. Reduce the potassium content in food by removing it through soaking, boiling, and ultra-low temperature refrigeration. Monitor the blood potassium concentration in time and adjust the potassium intake according to the urine volume at any time to avoid too high or too low blood potassium. 5, phosphorus diet Each gram of protein contains 15mg of phosphorus, so restricting protein intake also restricts the intake of phosphorus, phosphorus intake should be limited to 800mg/day. The following foods are high phosphorus food: whole grain cereals and products, offal, drupe and fruit and sauce products, chocolate, egg yolk, milk, dairy products, etc., should control the intake. 6, calcium supplements should be supplemented with 1000-1500mg per day, such as calcium carbonate, both calcium and correct acidosis, but also phosphorus binding agent.