The effects of Co₂O₃ on the crystallization and colorization of lithium aluminosilicate glass ceramic were investigated by using differential thermal analysis (DTA), X-ray diffractometry (XRD) and scanning electron microscope (SEM). The results showed that the introduction of Co₂O₃ not only changed the color of lithium aluminosilicate glass but also affected its crystallization by increasing the crystallizing maximum peak temperature (T_p) and weakening the crystallization ability. In addition, the color of LAS glass ceramics could be achieved by controlling the suitable Co₂O₃ and appropriate crystallization temperature.