uminescence and long persistence property of SrAl,2,O,4,:Eu,2+, are investigated in the paper.It is analyzed by emission spectra that the Eu,2+, luminescence in the above phosphor is caused by 5d-4f transition.Its luminescence decay follows ,I,=,ct,-n,which consists of the initial fast process and the later extremely slow process after 5 minutes.The thermoluminescent spectra of this phosphor consist two peaks.The temperatures of peak value are 117℃ and 155℃ respectively,this means the electron traps of phosphors are very deep,which can cause the extremely long persistence of SrAl,2,O,4,:Eu,2+,.