A series of Eu2+ -activated Sr3LnM(PO4)3F(Ln=Gd, La, Y; M=Na, K) phosphors were synthesized by high-temperature solid-phase method. The phase structure, morphology and luminescence characteristics of the samples were characterized by X-ray diffraction, scanning electron microscopy, fluorescence spectroscopy and other test methods. The experimental results demonstrate that the phosphor Sr3LnM(PO4)3F∶Eu2+ was successfully synthesized, and the particle size of the sample ranges from 2 μm to 10 μm. The phosphor has strong emission in the blue-light region, which is attributed to the 4f65d→4f7 transition of the luminescent center Eu2+. The emitting color of Eu2+ changes from light blue to dark blue and the color purity increases after the transformation of Na to K, which effectively regulates the luminescence of Eu2+ in fluorapatite Sr3LnM(PO4)3F. A new strategy by substituting of the secondary layer coordination atom is found to regulate the phosphors color of Eu2+.