Peritoneal dialysis, short for peritoneal dialysis, is a method of detoxification and drainage for uremic patients with the help of the peritoneal cavity. Once a patient with chronic renal failure enters the uremic phase, the accumulation of toxins and water in the body becomes more evident and can easily lead to a series of complications, requiring the use of hemodialysis and peritoneal dialysis for detoxification and drainage. The principle of peritoneal dialysis is to insert a catheter from the skin of the abdomen into the peritoneal cavity, inject peritoneal dialysis fluid into the peritoneal cavity, and leave it for 4 hours to allow sufficient exchange between the peritoneal dialysis fluid and the blood to remove toxins and excess water from the blood, and to allow the beneficial components of the peritoneal dialysis fluid to enter the blood, thus achieving detoxification and drainage and correcting electrolytes in the blood. Compared to hemodialysis, peritoneal dialysis is easier and can be performed at home, but it has the disadvantage of being prone to peritoneal cavity infections. After 5-8 years of peritoneal dialysis, the dialysis function gradually decreases and may have to be changed to hemodialysis if necessary.