Effects of WO3 addition on dielectric constant $varepsilon$r, quality factor Q and $ au$f of Zr0.8Sn0.2TiO4 (ZST) ceramics have been investigated. Up to 0.5 mol% WO3 addition dielectric constant of ZST was about 38 and was not changed with the amount of WO3 addition of WO3. Variation of dielectric constant of ZST with the amount of WO3 dopant showed the almost same behavior as the sintering density. Q value of ZST sintered at 139$0^{circ}C$ for 32 hours could be improved from 6800 to 8500 at 5.5 GHz with addition of 0.5mol% WO3. addition $ au$f of ZST was linearly decreased from 0 ppm/$^{circ}C$ to -4.2 ppm/$^{circ}C$ and then was not change with further addition of WO3