This study is a prospective phase II clinical trial designed to evaluate the deep response rate of the ZBR regimen (zanubrutinib combined with reduced-dose bendamustine and CD20 Monoclonal Antibody ) in treatment-naïve symptomatic Waldenström macroglobulinemia (WM) patients. Eligible patients will receive four cycles of the ZBR regimen, followed by zanubrutinib monotherapy for an additional eight months. The assessment period spans from the initiation of treatment until 12 months after treatment completion, with efficacy evaluations conducted every three cycles. Patients will be withdrawn from the study if they experience disease progression (PD) or show no response to treatment. Minimal residual disease (MRD) assessments will be performed at the end of the 3rd and 6th treatment cycles, as well as 12 months after treatment completion, involving evaluations of both bone marrow and peripheral blood MRD rates