Extranodal natural killer/T-cell lymphoma (ENKTL) is an aggressive non-Hodgkin lymphoma with poor prognosis in advanced stages, with a 5-year overall survival (OS) rate of less than 30% despite asparaginase-based regimens. Preclinical and clinical evidence suggests that PD-L1 is highly expressed in ENKTL, and PD-1 inhibitors show promising activity, while JAK1 inhibitors (e.g., golidocitinib) can reverse PD-1/PD-L1 inhibitor resistance and enhance anti-tumor immunity. This phase II study aims to evaluate the safety, tolerability, and anti-tumor activity of golidocitinib combined with pegaspargase and anti-PD-1 mAb as first-line therapy for advanced treatment-naive ENKTL, providing a novel therapeutic option for this patient population.