The effects of ZnO addition on the microstructures and microwave dielectric properties of 0.96Mg 0.95 Co 0.05 TiO 3 –0.04SrTiO 3 ceramics were investigated. ZnO was selected as liquid phase sintering aids to lower the sintering temperature of 0.96Mg 0.95 Co 0.05 TiO 3 –0.04SrTiO 3 ceramics. With ZnO additives, the densification temperature of 0.96Mg 0.95 Co 0.05 TiO 3 –0.04SrTiO 3 can be effectively reduced from 1450°C to 1250–1350°C. The crystalline phase exhibited no phase difference at low addition levels (0.5–4wt%). It is found that low-level doping of ZnO (0.5–4wt%) can significantly improve the density and dielectric properties of 0.96Mg 0.95 Co 0.05 TiO 3 –0.04SrTiO 3 ceramics. The quality factors Q×f was strongly dependent upon the amount of additives. Q×f values of 74,000GHz and 30,000GHz could be obtained at 1250–1350°C with 1wt% and 4wt% ZnO additives, respectively. During all additives ranges, the relative dielectric constants were not significantly different and ranged from 20.1 to 27.77. The temperature coefficient varies from −8ppm/°C to 2.7ppm/°C.