This randomized phase II exploratory clinical study aims to evaluate the efficacy and safety of SHR-1701 in patients with unresectable stage III non-small cell lung cancer (NSCLC). A total of 84 eligible patients will be randomized 1:1 into an induction immunotherapy group or a consolidation immunotherapy group. Group A will receive SHR-1701 combined with platinum-based chemotherapy as induction therapy followed by concurrent chemoradiotherapy (cCRT) and subsequent SHR-1701 consolidation therapy, while Group B will receive standard cCRT followed by SHR-1701 consolidation therapy. The primary endpoint is progression-free survival (PFS). Secondary endpoints include objective response rate (ORR), disease control rate (DCR), overall survival (OS), and safety outcomes.