Ce:GAGG single crystal in size of 50 mm×90 mm was grown by Cz method with radio frequency heating, and the grown crystal was measured by XRD. The cell parameters of Ce:GAGG single crystal were calculated based on the data of XRD. The transparency、XEL、light yield and decay time also were measured at room temperature. It can be found that the emission light of Ce:GAGG single crystal was centered at 540 nm, the light yield is about 54 000 photons/MeV, the energy resolution is about 7.2%@ 662 keV gama ray exciting, and the decay time is about 94 ns.