Sr₂SiO₄:xEu²⁺ samples were prepared using a so lid-state reaction method.Eu²⁺ activators are located at two different cr ystallographic sites,namely high energy site and low energy site.The emission band of Sr2－xSiO₄: xEu²⁺ is a super-position of two distinct emission peaks at 480nm and 530nm.The luminesc ence properties of the two different crystallographic Sr²⁺ sites are influ enced by Eu²⁺ concentration and excitation wavelength.It is found that the concentration quenching phenomenon is observed at two sites,with the increase of doping concentration.With the decrease of the excitation light energy,the emission in tensity ratio of low energy site to high energy site is increasing.It shows tha t different sites have an obvious selective absorption.The process parameters ar e also investigated in this paper.