Inclusion Criteria:  Patients are Han Chinese; Patients prepare for dialysis in our center, and start PD within 3 months after abdominal catheterization; Patients successfully complete the first peritoneal equilibration test(PET); Follow up regularly in our PD center.  Exclusion Criteria:  Patients from hemodialysis to peritoneal dialysis; Patients who need peritoneal dialysis due to transplant-renal loss;