Sr5－x(PO₄)₂SiO₄:xEu²⁺ ph osphors (x=0.010,0.015,0.020,0.025,0.050,0.100) were suc cessfully synthesized via the solid-state reaction method.The influence of doping concentration and test temperature on luminescence propertie s is investigated in details.With the increase of doping concentration,the lumi nescence intensity increases.The maximum intensity is reached at x=0.015,and then it decr eases.In a low concentration of Eu²⁺ (x≤0.025),tw o emission bands are observed because Eu²⁺ can accupy two different crystallog raphic site in the crystal structure. When x＞0.025,there is only one emission band in the emi ssion spectra,and it corresponds to the emission of Eu 2. This phenomenon may be caused by the energy transfer from Eu 1to Eu 2.The subs titution of Eu²⁺ (0.109nm) for the bigger Sr²⁺ (0.113nm) leads to the shrinking of the unit cell,and the n the crystal field enhances.The enhancement of crystal field results in the increase of the crystal field splitting of the 5d l e vel of Eu²⁺ ions,so the red shift is observed in the emission spectra.In addition,the emission wavelength shows a b lue shift with increasing temperature,but the blue shift behavior cannot be described by the Varshini equ ation,it may be due to the stability of lattice structure and the phonon-assisted tunneling.