Ho3+/Yb3+ codoped oxyfluoride silicate glass has been prepared. According to differetial thermal analysis (DTA) studies, the as-made glass was crystallized. X-ray diffraction (XRD) spectrum, transmission electron microscope (TEM) spectrum, absorption spectrum and up-conversion luminescence of glass ceramics were measured. The average crystallite size of CaF2 glass ceramics was calculated by Scherrer formula and compared with that of TEM. The crystal growth characteristics of nanometer CaF2 as well as effects on the diameter of CaF2 were studied by the kinetics theory of crystal growth. The dynamics equation of crystal growth of nanometer CaF2 was obtained. The upconversion fluorescence emission spectra of Ho3+/Yb3+ in oxyfluoride silicate glass ceramics were investigated and the upconversion luminescence mechanism of oxyfluoride silicate glass ceramics was analyzed . The results indicate that the oxyfluoride silicate glass ceramics is a potential luminescence material for upconversion green lasers.