Brief Summary: The investigators are registering all PD patients at recruited hospitals and developing a PD database in China. Patients will be followed up every 3 months, and both baseline and follow-up information will be collected and input into the registration system. The patient survival, technical survival, peritonitis rate, longitudinal changes of residual renal function and peritoneum function, and quality of life for PD patients, etc, will be compared using the PD database.