The LuAG∶Ce and LuAG∶Ce,Mg single crystals with a size of 80 mm×100 mm were grown by Czochralski method,and the scintillation properties of the crystal at room temperature were measured. The experimental results show that the light yield of the crystal is improved from 15 000±1 500 photons/MeV to 30 000±1 500 photons/MeV by Mg ion doping, and the decay time is accelerated from 120 ns to 54 ns.