[ $(BaSr)TiO_3$ ] thick films were prepared by tape casting method, using $BaTiO_3;and;SrTiO_3$ powder slurry in order to investigate dielectric properties i.e. dielectric constant, ${varepsilon}_r$, Curie temperature, $T_c$. Grain growth within $(BaSr)TiO_3$ thick films was observed with increasing weight ratio of $BaTiO_3$. This observation can be explained by phenomena of substitution of $Sr^{2+}$ ion for $Bi^{2+}$ ion in the $BaTiO_3$ system. Also, the Curie temperature in $(BaSr)TiO_3$ thick films was shifted to lower temperature range with increasing $ SrTiO_3$. Furthermore, Curie temperature having maximum dielectric constant was in the range of $-40^{circ}C;to;30^{circ}C$, and hence sharper phase transformation occurred at Curie temperature. There occurred decrease in tunability and k-factor of $(Ba_{0.6}Sr_{0.4})TiO_3$ calculated from the dielectric constant, ${varepsilon}_r$ above Curie temperature. In addition, above the $60^{circ}C$, phase fixation was observed. This means that internal stress relief occurred with increasing $90^{circ}$ domains.