• 18 to 75 years of age (including 18 and 75 years of age), regardless of sex;

• Stable CAPD patients treated with peritoneal dialysis for greater than or equal to 3 months;

• 25 ≤ serum ALB ≤ 40 g/L on two consecutive occasions prior to enrollment (two occasions one week apart);

• Blood potassium ≥ 3.5 mmol/L

• C-reactive protein (CRP) ≤ 2 x upper limit of normal (ULN);

• Carbon dioxide binding capacity \>18 mmol/L;

• Subjects voluntarily sign an informed consent form in writing prior to the commencement of any procedures related to the study, fully understand the purpose and significance of the trial, and are willing to comply with the trial protocol.