Pure submicron $SrTiO_3$ powders had been synthesized with chemical wet process that $5N-NH_4OH$ solution was sprayed into the mixed solution of $SrTiO_3$, $TiCl_4$ and $H_2O_2$ with $N_2$ carrier gas. The characteristic properties of powders obtained from this experiment were as follows. The optimum synthesis condition in reaction bath was above PH 8.5 and under $25^{circ}C$ The particle size of precipitated SrTiO(OH) powders dried at 6$0^{circ}C$ was under 0.01${mu}{ extrm}{m}$ and uniform. Amorphous precipitated complex powders emitted adsorbed water at 15$0^{circ}C$ less that and crystalline $SrTiO_3$powders was produced from calcining the complex at 30$0^{circ}C$. Sintered body of SrTiO3 fired at 133$0^{circ}C$ showed that relative dielectric constant was 228 at 1MHZ and bulk density was 4.73g/$cm^3$