Abstract: In the present work, the Pr3+-Yb3+ codoped oxyfluoride glass in SiO2-Al2O3-Na2O-CaF2 system was prepared and the transparent oxyfluoride glass ceramic was obtained by optimized heat treating conditions. The crystallization mechanism was analyzed by kinetics method, and the influences of heat treating conditions on the crystallization behavior and the microstructures of this system glass ceramic were studied. The formation of CaF2 nanocrystals sized at 30 nm was confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the rare earth ions were supposed in CaF2 nanocrystals in the form of solid solution Ca0.8Yb0.2F2.2. Infrared quantum cutting involving 980 nm and 1 015 nm (2F5/2→2F7/2) emissions from Tb3+was achieved upon the excitation of the 3P0 energy level of Pr3+ at 482 nm.