In this study, PLZT ceramics were fabricated by freeze-drying and normal sintering method. The compositional rate of specimen was selected 9/65/35 (La/Zr/Ti) which have good optical and dielectric properties, sintering time was varied 1, 10, 30, 40, 50, 55, 60 and 65 hr at $1250^{\circ}C$. After sintering, the optical and dielectric properties were investigated with the grain size. As the result of the experiment, freeze-dried powder appeared particle size less than 1 um. The relative dielectric constant was increased linearly with the sintering time, specimen which sintered for 65 hr had the highest value, 5780. Grain was grown with increasing time, in the case of specimen sintered for 60 hr, the grain size was 8.4 um. Transmittance was increased with the grain size. In the case of 8.4 um grain size, the transmittance was 56 %. Curie temperature was decreased linearly by the surface-layer effect of space-charge, in the case of grain size which were 1.8 um and 8.4 um, appeared at $100^{\circ}C$ and $80^{\circ}C$, respectively.