• The subjects voluntarily joined the study, signed the informed consent, and the compliance was good;

• ≥18 years old (calculated by the date of signing the informed consent); Both men and women; ECOG score 0\

⁃ 1; Expected survival ≥3 months;

• Patients with stage IIA-IIIA NSCLC who had previously received PD-1/PD-L1 inhibitors combined with chemotherapy neoadjuvant therapy and underwent R0 resection for curative purposes before surgery (note: the disease was presented in the American Joint Committee on Cancer (AJCC)/Union International Against Cancer (UICC) 8th edition of lung cancer TNM staging);

• For patients who did not achieve pathological complete response after PD-1/PD-L1 inhibitor combined with chemotherapy neoadjuvant treatment, and the time between the first trial medication after surgery was required to be 4-12 weeks;

• The main organs function well and meet the standards;

• Women of reproductive age should agree that effective contraception must be used during the study period and for 6 months after the end of the study, and that serum or urine pregnancy tests are negative within 7 days prior to study enrollment; Men should agree that effective birth control must be used during the study period and for 6 months after the end of the study period.