A Phase I/II Study of the Pan-immunotherapy in Patients With Local Advanced/Metastatic BTC

Inclusion Criteria: 1. ≥ 18 years old. 2. Life expectancy of at least 3 months. 3. Subjects must have Histopathological/cytological diagnosis of unresectable or recurrent /metastatic biliary tract carcinoma (intra-hepatic, extrahepatic or gall bladder). 4. Eastern Cooperative Oncology Group performance status 0-2. 5. Subjects must have at least one measurable lesion ≥ 1 cm as defined by response criteria. 6. Subjects may have received prior radiotherapy, chemotherapy, or other local ablative therapies, which completed ≥ 4 weeks prior to registration AND patient has recovered to \<= grade 1 toxicity. 7. Subjects with Anti-PD-1 antibody treatment history are eligible which must be resistance. 8. Adequate organ function. 9. Participants of childbearing potential must be willing to use an adequate method of contraception for the course of the study through 120 days after the last dose of study drug. Exclusion Criteria: 1. Subjects with any autoimmune disease or history of syndrome that requires corticosteroids or immunosuppressive medications. 2. Serious uncontrolled medical disorders or active infections, pulmonary infection especially. 3. Prior organ allograft. 4. Women who are pregnant or breastfeeding. 5. Women with a positive pregnancy test on enrollment or prior to investigational product administration. 6. Subjects who are compulsorily detained for treatment of either a psychiatric or physical (eg, infectious disease) illness.