Abstract: Dielectric/metallic multilayer UV filter applied for the suppression of slow component of BaF₂ scintillator was prepared with electron beam evaporation, and the effects of γ-ray, neutron and laser beam on the filter were characterized. Results show that the performance of the filter keeps unchanged under γ-ray irradiation of 1×10⁵ Gy and neutron irradiation of 4.0×10¹³cm^-2. The damage threshold of the filter irradiated by laser beams is related to the layer which was first encountered by the laser beam, and its thickness determines the damage threshold of the filter.