Er³⁺-doped tellurite glasses with composition in mol percent of 75TeO₂-10Nb₂O₅-10ZnO-5Na₂O-0.5Er₂O₃-xCe₂O₃( x=0.00,0.25,0.50,0.75,1.00) were prepared by conventional melt-quenchi ng method.The absorption spectra,up-conversion luminescence spectra,Raman spectra and the flu orescence spectra of the glasses were measured.The intensity parameters Ω_t(t=2,4,6), spontaneous radiative transition probability A,fluor escence branching ratio β and radiative lifetime τrad were calculated by Judd-Ofelt theory,and the Er³⁺ stimu lated emission cross-section was calculated by McCumber theory.The bandwidth quality factor (σpeak_e×FWHM) and gain qu ality factor (σpeak_e×τm) of Er³⁺ ions were compared between the glasses, and the energy transfer (ET) mechanism between Er³⁺/Ce³⁺ ions and th e suppression effect of Ce³⁺ ions on up-conversion luminescence were also analyzed.The studies indicate that the add ition of appropriate amount of Ce³⁺ ions can improve the spectral properties of Er³⁺-doped telluri um-niobium-zinc-sodium glasses.