A green-blue phosphors Sr5(PO4)3 F∶Eu2+ was prepared by high temperature solid-state method. The structure and spectral properties of the phosphor were characterized, and the effects of flux was studied. The results show that the doping of rare earth ions Eu2+ in Sr5(PO4)3F system does not change the structure; the excitation spectrum of phosphors Sr5(PO4)3F∶Eu2+ is the broadband with the main peak at 418 nm, and the emission spectrum is the broadband with the main peak at 524 nm; the optimum doping concentration of Eu2+ in phosphors Sr5(PO4)3F∶Eu2+ is 15mol%. Therefore, the phosphor Sr5(PO4)3F∶Eu2+ is a green-blue phosphor which can be effectively stimulated by near ultraviolet LED. The doping effects of flux have been studied, also. The results show that the doping concentration of flux H3BO3 is 5wt% in Sr5(PO4)3F∶Eu2+ system, which could reduce the reaction temperature from 1200 ℃ to 1100 ℃ and enhance the luminous intensity remarkably.