$BaTiO_3$ and $SrTiO_2$ were mixed with the mole ratio of 36:65:50, 50: 50 and 65:35 and then heated at 110$0^{circ}C$~130$0^{circ}C$ for 1~64 hrs. The solid state reactions and dielectric properties were investigated as a function of amount of solid solution. Activation energy of solid solution decreased with increasing amount of $BaTiO_3$ due to fast diffusion of $Ba^{2+}$ ions. Dielectric constants increased with increasing the soaking time at 125$0^{circ}C$and 130$0^{circ}C$ and Curie Temperature shifted to higher temperature with increasing the soaking time at 125$0^{circ}C$ and 130$0^{circ}C$. It attributes to the am-ount of solid solution and grain growth, Dielectric constants decreased and Curie Temperature shifted to lower temperature due to decreasing polari-zability.