A series of phosphors Ca12-x-yMxAl14O32F2∶yEu (M=Mg, Sr, Ba) are synthesized by the high temperature solid-state reaction, and their phases and fluorescence properties are tested by using X-ray powder diffractometer and fluorescent spectroscope. The composition and structure of Ca12Al14O32F2∶Eu 3+ /Eu 2+ can be adjusted by doping alkaline metal ions, and the luminescent properties of Ca12-x-yMxAl14O32F2∶yEu (M=Mg, Sr, Ba) are affected. The results show that doping Mg 2+ in Ca12Al14O32F2∶Eu is not conducive to the reduction of Eu 3+, but doping Sr 2+ or Ba 2+ is helpful for the reduction of Eu 3+. Adjusting the concentration ratio of Eu 3+ to Eu 2+ by changing the doping concentration of alkaline earth metal ions, the intensity ratio of blue to red can be adjusted, and the color of the samples can be adjusted from blue to lavender, and to bluish green.