The dietary principles for patients with renal failure should pay attention to two aspects: first, calorie supply; second, nutrients. Calorie supply requires 30kcal/kg/d, mainly provided by sugar and fat, with sugar accounting for 60%-70% of total calories, fat 15%-20% and protein 13%-17%, with at least 50% of protein being high-quality protein. Protein intake is different according to the stage of renal failure, generally 0.8-1g/kg/d for stage 1-2 and 0.6-0.8g/kg/d for stage 3-4. Intake of protein can be increased to 1-1.2g/kg/d when entering dialysis stage. fat intake is mainly vegetable oil, and animal fat, such as lard, should be consumed as little as possible. Sugar intake is the main source of body calories, you can eat more food with high starch content, such as corn, buckwheat, millet, etc., but control the amount of food. Patients who do not have swelling can do without restricting water intake; if they have swelling, the daily intake of water is the previous day’s urine volume plus 500ml is sufficient. You can properly eat more fresh vegetables, eat less or no food containing high phosphorus, try to reduce the intake of potassium-containing food, and control the salt at 3-5g per day, and try not to exceed 6g.