Kinetics of non-isothermal precipitate process and crystal growth of perovskite (CaO . TiO2) phase in CaO-TiO2-SiO2-Al2O3-MgO system were studied. The experimental results show that the relative volume fraction can be described by the equation given by Matusita et al. and the experiential expression of average crystal radius was obtained. The particle coarsening in non-isothermal process has important effects on the crystal growth of perovskite phase.