0.6Ca0.61La0.26TiO3-0.4La(Mg0.5Ti0.5)O3［0.6CLT-0.4LMT］ ceramics were prepared by microwave sintering. The effect of sintering process on its microstructure and grain growth behavior was studied. A Hillert model and Sellars simplified model was established by linear regression, and a nonlinear regression method was used to establish the Sellars-Anelli model with time index. The results show that with the increase of sintering temperature and the increase of holding time, the grain size is larger, and the effect of the sintering temperature on the grain growth is more obvious. The grain sizes predicted by the three models and the experimental results were analyzed. It is found that the Hillert model has the lowest prediction accuracy for the ceramic, and the Sellars-Anelli model has the highest prediction accuracy for this ceramic. The Sellars-Anelli model is d4.718=d4.7180+4.516×1033×t0.888×exp, which can effectively predict the grain growth process of 0.6CLT-0.4LMT ceramic by microwave sintering.