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The glass-forming regions of tellurium-gadolinium-tungsten ternary system prepared at 1000 ℃ for 60 min were firstly determined.To improve density,the full replacement of lutetium for gadolinium to form Tb3+-activated tellurium-lutetium-tungsten glasses with the composition of 64TeO2-20WO3-(16-y)Lu2O3-yTb2O3 were designed for scintillation application.The concentration-dependent optical properties of Tb3+-activated tellurium-lutetium-tungsten glasses were fully investigated by trans-mittance,excitation and emission spectra,together with the luminescence decay curves.The energy transfer mechanism was discussed according to Huang's rule.The optimized 4 mol％Tb2O3 activated tellurium-lutetium-tungsten glasses with the density of 6.49 g/cm3 and the lifetime of 0.551 ms are developing to be suitable for the potential detection of slow events in the future work.