The Sr₂SiO₄:Dy³⁺ phosphor was synthesized by the high temperature solid-state reaction method in air.DY₂O₃(99.9%),SiO 2(99.9%),SrCO 3(99.9%),Li 2CO 3(99.9%),Na₂CO 3(99.9%) and K 2CO 3(99.9%) were used as starting materials,and the Dy³⁺ doping concentration was 2 mol%.The emission spectrum was measured by a SPEX1404 spectrophotometer,and all the characterization of the phosphors was conducted at room temperature.The emission spectrum of Sr₂SiO₄:Dy³⁺ phosphor showed several bands centered at 486,575 and 665 nm under the 365 nm excitation.The effect of Li+,Na+ and K+ on the emission spectra of Sr₂SiO₄:Dy³⁺ phosphor was studied.The results show that the location of the emission spectrum of Sr₂SiO₄:Dy³⁺ phosphor was not influenced by Li+,Na+ and K+.However,the emission spectrum intensity was greatly influenced by Li+,Na+ and K+,and the evolvement trend was monotone with different charge compensation,i.e.the emission spectrum intensity of Sr₂SiO₄:Dy³⁺ phosphor firstly increased with increasing Li+ concentration,then decreased.However the charge compensation concentration corresponding to the maximum emission intensity was different with different charge compensation,and the concentration is 4,3 and 3 mol% corresponding to Li+,Na+ and K+,respectively.And the theoretical reason for the above results was analyzed.