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The phosphate glasses doped with Eu2+ ions, Gd3+ ions respectively and co-doped with Gd3+ ions and Eu2+ ions were synthesized by high-temperature melting method.The transmission and luminescence properties at different molar concentrations of Gd3+ ions and Eu2+ ions were investigated.The energy transfer process between Gd3+ ions and Eu2+ ions were studied according to excitation and emission spectra and decay curves.From the excitation spectra and the emission spectra in Eu2+ ions singly doped glass samples, when the molar concentration of Eu2+ ions is found to be approximately 0.02 mol%, the intensity of the excitation spectra and the emission spectra show much higher than others for all the glass samples singly doped with Eu2+ ions.According to the analysis of the excitation and emission spectra and decay time measurements, with 0.02 mol% Eu2+ ions, the best molar concentration of Gd3+ ions is 0.3 mol %, and energy transfer process from Gd3+ ions to Eu2+ ions is nonradiation resonant process using Dexter theory.The decay curves of Gd3+ ions are expressed by the Inokuti-Hirayamas model to analyze energy transfer mechanism between Gd3+ ions and Eu2+ ions.And the energy transfer efficiency is calculated.