Effect of the microwave dielectric properties and the microstructure on a mole fraction(x=0.1~0.9) of (1-x)Mg$_2$SiO$_4$-xZnAl$_2$O$_4$ ceramics was investigated. When (1-x)Mg$_2$SiO$_4$-xZnAl$_2$O$_4$(x=0.1~0.9) ceramics were sintered at 130$0^{circ}C$, 135$0^{circ}C$ and 140$0^{circ}C$ for 2hr, the microwave dielectric properties were obtained $varepsilon$r=6.8~8.3, Q.f$_{0}$=36000~77600. On the other hand, the temperature coefficients of resonant frequency($ au$$_{f}$) were obtained in the properties of -62ppm/$^{circ}C$ to -49ppm/$^{circ}C$. In order to adjust the temperature coefficient of resonant frequency($ au$$_{f}$), CaTiO$_3$was added in (1-x)Mg$_2$SiO$_4$-xZnAl$_2$O$_4$ceramics. 0.7Mg$_2$SiO$_4$-0.2ZnAl$_2$O$_4$-0.1CaTiO$_3$ceramics sintered at 135$0^{circ}C$ for 2hr showed the excellent microwave dielectric properties of $varepsilon$r=7.7, Q.f$_{0}$=32000, and $ au$$_{f}$=-7.9 ppm/$^{circ}C$.EX>.>.EX>.