• Fully understand the study and voluntarily sign the informed consent form;

• Age ≥18 years old;

• Pathologically (including histologically or cytologically) confirmed as peritoneal mesothelioma;

• ECOG performance status of 0-1;

• Expected survival of ≥3 months;

• Function of vital organs must meet the following criteria (use of any blood products and cell growth factors is not allowed within 14 days prior to enrollment): Absolute neutrophil count ≥1.5×10\^9/L; Platelets ≥100×10\^9/L; Hemoglobin ≥90g/L; Total bilirubin \<1.5 times the upper limit of normal (ULN); ALT and AST \<2.5×ULN, GPT ≤1.5×ULN; Serum creatinine ≤1×ULN; Creatinine clearance rate \>60 ml/min (Cockcroft-Gault formula);

• Women of childbearing potential must have a negative serum pregnancy test within 7 days before enrollment and agree to use appropriate contraception during the trial and for 8 weeks after the last dose of trial medication; for men, must be surgically sterilized or agree to use appropriate contraception during the trial and for 8 weeks after the last dose of trial medication;

• Have not participated in other clinical studies within 4 weeks before enrollment and during treatment. -