Abstract: Patients with chronic rhinosinusitis (CRS) often suffer from olfactory dysfunction (OD), which seriously affects their quality of life. Traditional therapeutic interventions have limited efficacy in improving olfactory function. Olfactory training (OT), based on the mechanism of olfactory nerve plasticity, promotes the recovery of olfactory function and has become a research hotspot in recent years. This paper systematically reviewed the mechanisms by which OT promotes the reconstruction of olfactory function in patients with chronic rhinosinusitis with olfactory dysfunction (CRS-OD), as well as its implementation strategies and evidence-based application effects. It proposes a patient-centered, stepwise OT nursing intervention plan that integrates digital adherence tracking and psychological support, providing evidence-based support for the standardization of olfactory rehabilitation pathways.