The samples of the Tm3+/Dy3+ co-doped bismuth glasses are successfully prepared by the conventional high temperature melt-quenching method. By means of the differential scanning calorimetry curves, Raman spectra, absorption spectra, infrared transmittance spectra, fluorescence spectra and fluorescence decay curves of the samples, the 1.47 μm broadband emission properties of the samples pumped by 800 nm laser diode (LD) are investigated. The results show that, the prepared bismuth glasses have a good thermal stability, a low phonon energy and a high infrared transmissivity. When the mole fraction of Dy3+ is 0.3%, the sensitivity enhancement of the 1.47 μm emission of Tm3+ is achieved and the full-width at half-maximum of the fluorescence spectrum is 118 nm. The calculated maximum stimulated emission cross section of 1.47 μm emission is 4.37×10-21 cm2 and the figure of merit for the fiber amplification is 5.31×10-26 cm3.