Abstract: A series of phosphor based on SrMg₂（PO₄）2 were synthesized by solid state methods. And the phosphors were characterized by XRD and photoluminescent emission and excitation spectra. As Ca is substituted for Sr partly in SrMg₂（PO₄）₂:Eu²⁺,Mn²⁺ phosphor, its blue emission and red emission from Eu²⁺ and Mn²⁺, respectively, were found show a remarkable red and blue shift. On the other hand, as Tb³⁺ with a green emission was introduced into the phosphor Sr_0.6Ca_0.4Mg₂（PO₄）2:Eu²⁺, Mn²⁺, a full color emitting phosphor was obtained. White emitting phosphors were also obtained for the Eu²⁺ and Tb³⁺ co-doped SrMg₂（PO₄）₂ by adjusting the contents of two activators.