Photonic crystal fiber lasers have been paid much attention by many researches, and the preparation of photonic crystal fiber cores becomes the key problem in the study of the photonic crystal fibers. Er3+ doped aluminium-cadmium heavy-metal silicate glass sample was prepared by the method of high temperature melting. Its absorption and fluorescence spectra were measured. Using the Judd-Ofelt theory, its intensity parameter ?赘t (t=2,4,6), the oscillator strength and spontaneous radiation probability of the Er 3+ ion, fluorescence branching ratio, and the fluorescence lifetime were theoretically calculated. Using the fluorescence spectrum, the stimulated emission cross section of the 4I13/2→4I15/2 transition and the full width at half maximum(FWHM) of the fluorescence band were also measured. The result demonstrates that the Er3+ doped aluminium-cadmium heavy-metal silicate glass sample possesses a large stimulated emission cross section, a wide fluorescence FWHM, and high quantum efficiency of 92.6%. These parameters clearly indicate that this kind of silicate glass has a good laser excitation property and is expected to be applied in the study of the doped photonic crystal fibers.