The dielectric properties and synthesis of $LaAIO_3$ ceramics from mixtures of $La_2O_3$ and $AI(OH)_3$ via ground(planetary ball mill) and unground(wet ball mill) were investigated. The single phase $LaAIO_3$ of ground powder was formed at $1000^{circ}C$, while that of unground powder was formed at $1300^{circ}C$. Density and grains of ground sample showed 98% of theory density and a uniform size of 0.75mu extrm{m}$, respectively, However those of unground sample showed 93% and non-uniform sizes of 4-5 $mu extrm{m}$. Dielectric constant and temperature coefficient of capacitance ($ au$c) of both ground and unground samples were 21~22 and +70~74 ppm$/^{circ}C$, respectively. Dielectric loss of ground sample(0.0004) was 10 times as low as that of unground sample(0.003) due to a uniform and small gram size.