Ce0.67Tb0.33MgAl11O19: Gd3+ has been synthesized by processing of sol-gel, the influence of Gd doping on fluorescence of Ce0.67Tb0.33MgAl11O19 was investigated by changing the concentration and the substituted object of Gd3+ ion. The effects of substituting a part of Ce and a part of Tb with Ga on fluorescence of Ce0.67Tb0.33MgAl11O19 was studied respectively. Gd3+ transfers the energy absorbed by Ce3+ to Tb3+ efficiently, so the fluorescence intensity of Ce0.67Tb0.33MgAl11O19 changed less when Gd3+ is doped into Ce0.67Tb0.33MgAl11O19, even enhanced to some extent, And the emission color of Ce0.67Tb0.33MgAl11O19 will change a little.