The purpose of the study is to evaluate the efficacy and safety of NALIRINOX combined with PD-1 synchronous sequential SBRT or AG combined with PD-1 synchronous sequential SBRT as first line systematical therapy in patients with ocally advanced pancreatic cancer.

Inclusion Criteria:

1. Histologically or cytologically confirmed pancreatic cancer;
2. ECOG performance no more than 2;
3. Radiographically assessed as locally advanced pancreatic cancer according to NCCN guidelines;
4. No previous anti-tumor therapy；
5. Able and willing to provide a written informed consent;

Exclusion Criteria:

• 1. Prior anti-tumor therapy of any kind; 2. Severe infection (>NCI CTC grade 2); 3.Patients with autoimmune disease or immune deficiency who are treated with immunosuppressive drugs; 4.Patients with bleeding tendency; 5. Pregnant or lactating women.