Some glasses with Er³⁺-doped Bi₂O₃-B₂O₃-Ga₂O₃ glasses were prepared. The absorption spectra,fluorescence spectra,fluorescence lifetime of⁴I_13/2 level and thermal stability were measured. The intensity parameters were calculated using Judd-Ofelt theory,and the stimulated emission cross sections of the Er³⁺ ion ⁴I_13/2→⁴I_15/2 transition were calculated using the McCumber theory. The results show that FWHM,σe and fluorescence lifetime have a peak value when contenting 8% mol Ga₂O₃ in the glass. The maximal FHWM reaches 81 nm and the peak value of σe reaches 1.03×10^－20cm². Meanwhile the thermal stability is also improved with the increase of Ga₂O₃. The Bi₂O₃-B₂O₃-Ga₂O₃ glass has some excellent optical properties and beneficial for EDFA to realize high gain,low noise and broadband.