Er³⁺-doped(100－x) TeO₂－xNb₂O₅(x=5,10,15,20 mol%) niobic tellurite glasses were synthesized,and their density,refractive index,glass transition temperature,crystallization temperature,Vickers microhardness,absorption spectra,fluorescence spectra and the lifetimes of Er³⁺: ⁴I_13/2 level were measured. The Judd-Ofelt strength parameters Ω_t(t=2,4,6) and the stimulated emission cross-section (σ_emi) were calculated by Judd-Ofelt theory and McCumber theory,respectively. The compositional dependence of optical parameters of Er³⁺ in glass samples wase investigated. The properties of Er³⁺-doped niobic tellurite glasses were compared with that of the typical 75TeO₂－20ZnO－5Na₂O(TZN) tellurite glass in aspect of thermal,mechanical,spectroscopic properties and amplification merit.