The primary objective of this study is to evaluate whether neoadjuvant SBRT as an immunomodulator in combination with apalolimab and toripalimab (QL1706) plus chemotherapy improves the pathological complete response (pCR) rate in patients with resectable stage IIA-IIIB LUAD. The secondary objectives include major pathological response (MPR), disease-free survival (DFS), R0 resection rate, the feasibility and safety. Moreover, the potential predictors for pathological response also will be explored.