According to statistics, more than 80% of patients with renal failure already have hypertension when they start dialysis, which is an important cause of atherosclerosis and heart failure, and a major factor leading to death and other fatal cardiovascular and cerebrovascular complications in dialysis patients. Therefore, for long-term hemodialysis patients, whether blood pressure can be effectively controlled is closely related to the long-term survival rate and quality of life of dialysis patients. In addition to the application of good anti-blood pressure drugs, diet also plays an important role in the good or bad blood pressure control. An important aspect of blood pressure control in long-term dialysis patients is to correct water and sodium retention and restore the body to normal extracellular volume. Dry weight” is commonly used as a measure, which is the ideal volume balance point achieved after dialysis treatment, without swelling, heart failure, pulmonary edema, ideal blood pressure, and no pericardial, thoracic, or abdominal fluid accumulation. The “dry weight” is usually re-evaluated periodically (every 3 months) according to changes in condition, appetite, nutritional status, etc. During dialysis, the diet and water intake should be controlled so that the weight gain does not exceed 2.5%-3.0% of the body weight, and the sodium intake should be limited.