Peritoneal dialysis produces less water and can be changed to a higher concentration of sugary peritoneal fluid. The principle of peritoneal dialysis is to insert a tube into the peritoneal cavity in the abdomen, pour peritoneal dialysis fluid into it, and leave it for four hours to allow the blood and dialysis fluid to fully exchange, and then the peritoneal dialysis fluid is discharged out of the body, so as to achieve the purpose of detoxification and drainage. The removal of water by peritoneal dialysis is mainly dependent on the concentration of sugar in the dialysis fluid. If the drainage decreases during peritoneal dialysis, the concentration of sugar can be increased at this time. However, blindly increasing the sugar concentration is not good for the peritoneum, it can lead to the strengthening of peritoneal fibrosis, the peritoneal function is gradually lost, and finally may have to give up the peritoneal dialysis, and switch to hemodialysis. Generally speaking, the duration of peritoneal dialysis is not very long, that is, the peritoneal function is basically lost in 2-3 years, and then it is necessary to perform hemodialysis to let the peritoneum rest for a period of time, and then switch to peritoneal dialysis.