Persistent luminescence material Sr1.94－xBaxMgSi₂O ₇:Eu²⁺0.01,Dy³⁺0.05 was synthesized by solid-state reaction method in hydrogen reducting atmosphere and carbon monoxide reducting a tmosphere,respectively.The impacts of reducing atmosphere on photoluminescence and persistent luminescence properties are studied systematically.The results show that the crystal structures of these phosphors change with the increase of barium ion content,and then the change in crystal structures leads to the shift of the peaks of emission and persistent luminescence spectra.The phosphors synthesized by different reducting methods h ave some differences in crystal structure,photoluminescence and persistent luminescence properties.The phospho rs synthesized in carbon monoxide reducting atmosphere have higher purity than the samples syn thesized in hydrogen reducting atmosphere.What is more,as for persistent luminescence pr operties,the phosphors synthesized in carbon monoxide reducting atmosphere have superior performance in initial lu minance and afterglow decay to the samples synthesized in hydrogen redu cting atmosphe re.This result indicates that it is easier to synthesize pure phase phosphors with the traps which have appropriate concentration and depth by carbon monoxide reducting method and that is good for their persistent luminescence properties.