An important function of the kidneys is urination, whereby not only metabolic wastes are excreted but also the body’s water balance is maintained. When renal impairment leads to kidney failure, the most obvious damage to the body is the accumulation of metabolic wastes and water in the body, causing a series of life-threatening consequences. Patients with kidney failure are in great pain. Currently, there are two main treatments used by the medical community, one is kidney transplantation and the other is extracorporeal dialysis. The medical cost of kidney transplantation is around 120,000 RMB, but the difficulty is that there is a shortage of kidney sources, and it is not easy to find a kidney with a suitable match, so not many people can do kidney transplantation. Most patients use extracorporeal dialysis, there are two types of dialysis, one is hemodialysis which must be operated by professionals in hospitals, generally hemodialysis is performed 2 to 3 times a week, each time takes 4 hours. One type of dialysis method that is widely used abroad is peritoneal dialysis. According to experts from Baxter, a company that uses 80% of peritoneal dialysis products, peritoneal dialysis patients can do it at home, four times a day, each time taking 30 minutes. Although it is financially comparable to the expense of hemodialysis, it is popular because of its convenience and ease of use. Most importantly, because peritoneal dialysis is performed every day, the toxins metabolized by the body are excreted in a timely manner, so the patient is in a much better state of mind and is less restricted in his or her daily life. Peritoneal dialysis uses the body’s natural semi-permeable membrane, the peritoneum, as the dialysis membrane. Due to the restriction of the endothelium of the peritoneal capillaries and the basement membrane, oversized molecules cannot be permeated from the peritoneum, such as red blood cells and large molecules of globulin, etc. Through diffusion and ultrafiltration, the purpose of removing metabolites and correcting electrolyte disorders is achieved. Peritoneal dialysis is a treatment method that is simple to operate and easy to master, and can be used to travel and live like a normal person, with little impact on the heart and blood vessels. Our department uses the Biotek Dual System (i.e., a disposable “Y” shaped device with two bags) for maintenance peritoneal dialysis (CAPD) for the treatment of chronic renal failure. Continuous ambulatory peritoneal dialysis (CAPD) is a portable method of dialysis for patients with end-stage renal disease, and its benefits have been recognized worldwide. Indications for peritoneal dialysis: (1) Acute renal failure. (2) Chronic renal failure. (3) Acute drug or toxic poisoning. Contraindications: (1) Recent abdominal surgery with abdominal drainage. (2) High intestinal obstruction or colostomy or fecal fistula. (3) Diaphragmatic hernia. (4) Limited peritonitis and extensive peritoneal adhesions. (5) Diffuse malignant tumors in the abdominal cavity or lesions of unclear nature. (6) Severe pulmonary lesions with respiratory distress. (7) Pregnancy.