Abstract: Influence of nucleation agent F^- on the crystallization of CaO-Al₂O₃-SiO₂ glass was studied by using DTA, XRD and SEM. The results indicate that CaF₂ can effectively prompt full crystallization. By means of suitable heat treatment, a white glass-ceramics can be obtained with the crystal grain size of 0.1~0.2μm. The major crystalline phases of the glass-ceramics are diopside (CaMg(SiO₃)₂) and wollastonite (β-CaSiO₃). With the increase of CaF₂ content, diopside increases and wollastonite decreases.