The crystalline phases of Ce3+-doped gadolinium gallium aluminum garnet (GGAG) glass-ceramics were investigated by X-ray diffraction,and the fluorescence spectra were recorded under the pumping of blue light-emitting diode (LED) using an integrating sphere of 10-inch in diameter,which connected to a CCD detector. The spectral power distribution of the glass-ceramics was obtained from the measured spectra first,and then the quantum yield was derived based on the photon distribution. The quantum yield of Ce3+ emission in GGAG glass-ceramics is 29.2%,meanwhile,the color coordinates and the correlated color temperature (CCT) of combined white light were proved to be x=0.319,y=0.349 and 6 086 K,respectively. Although the quantum yield is a little smaller than the value in Ce3+-doped YAG glass-ceramics,the CCT of the combined white light is much smaller than that in the latter. The optical behavior of GGAG glass-ceramics provides new vision for developing comfortable LED lighting devices.