Ce3+-doped scintillating glasses with up to 30%(mole fraction) Gd2O3 and high density in the system SiO2-B2O3-Al2O3-Gd2O3 have been prepared. Absorption and fluorescence properties of substitutions of Al2O3 by BaO and La2O3 have been investigated. Optimum luminescent intensity and absorption in these glasses is detected when the mole fraction of BaO is 10%. Meanwhile, substitutions of Al2O3 by BaO or La2O3 also lead to the red shift of the emission and excitation peak. Scintillating performance are shown under X-ray irradiation, but the result shows that the peak wavelength red shifts 40 nm compared with the peak of emission spectra under 330 nm ultraviolet light excitation suggests the different mechanism between fluorescence and scintillating light.