Peritoneal dialysis is the abbreviation of peritoneal dialysis, which is a method of detoxification and drainage for uremic patients with the help of peritoneal cavity. Once a patient with chronic renal failure enters the uremic stage, the accumulation of toxins and water in the body will be more obvious, which will easily cause a series of complications, and need to use hemodialysis and peritoneal dialysis to carry out detoxification and drainage. The principle of peritoneal dialysis is to insert a catheter from the abdominal skin into the peritoneal cavity, inject peritoneal dialysis fluid into the peritoneal cavity, and leave it for 4 hours, so that the peritoneal dialysis fluid can fully exchange with the blood, remove toxins and excess water in the blood, and allow the beneficial components of the peritoneal dialysis fluid to enter into the bloodstream, which can achieve the purpose of detoxification and drainage and correct the electrolytes in the blood. Compared to hemodialysis, peritoneal dialysis is easier and can be done at home, but it has a disadvantage in that it is prone to peritoneal cavity infection. After 5-8 years of peritoneal dialysis, the dialysis function gradually declines and may have to be changed to hemodialysis if necessary.