Eu-doped MgO single crystals irradiated with 6 MeV Xe ions using 320 kV high voltage experimental platform are investigated by fluorescence spectroscopes. Photoluminescence (PL) intensity of Eu-doped MgO becomes stronger than that of MgO. PL peaks located at 380~550 nm decrease in PL spectra of Eu-doped MgO irradiated with small dose, the intensity of the emission band becomes strong when irradiation dose increases up to 5×1015/cm2. Those photoluminescence phenomena are explained by Fourier transform infrared spectra and Raman spectra.