The synthesis of 4 (SrEu)O·7Al,2,O,3, phosphor and the effects of the concentration of activator Eu, contents of B,2,O,3, and P,2,O,5, on fluorescence property were investigated.The phosphors were prepared by solid state reaction of Al(OH),3, SrCO,3, Eu,2,O,3, and H,3,BO,3, firing in air at 1550℃ for 3hr followed by flowing in H,2,-N,2, at 1250℃ for 3hr.It was found that B,2,O,3, and P,2,O,5, influenced the luminescence brightness and emission spectra of the phosphor. The emission peak of phosphor shifted from 520nm to 490nm with adding H,3,BO,3, and (NH4),2, HPO,4, in raw material. Meanwhile, the emission intensity was remarkably enhanced by adding (NH,4,)ZHPO,4, to starting material.The results show that adding P,2,O,5, to 4(Sr,1-x,Eu,x,)0.7Al,2,O,3, leads to more effective energy transfer from 410 emititng center to 490nm one. The two bands might be originated from inequivalent Eu ions (Eu ions on different crystallographic sites)In addition to the fast decay of phosphor (τ~40-50μs), the long fluorescence aftergrow was also observed to last for a few hours.