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The effect of calcium borosilicate (CBS) glass ceramic on the phase formation, the microstructures and the microwave dielectric properties of 0.95(Mg 0.98 Zn 0.02 )-TiO 3 -0.05CaTiO 3 (MZCT) ceramics prepared via the conventional solid-state reaction route were investigated. It has been found that (Mg 0.98 Zn 0.02 )TiO 3 and CaTiO 3 are the main phases and a second phase (Mg 0.98 Zn 0.02 )Ti 2 O 5 appeared in MZCT ceramics doped with CBS glass. As the content of CBS glass increased, the second phase (Mg 0.98 Zn 0.02 )Ti 2 O 5 further enhanced. Appropriate CBS glass addition could effectively facilitate sintering of the ceramics, and well-densified microwave ceramics with uniform grains could be obtained under 1240°C. An extremely high Q 9 f of 59,200 GHz together with an e r of 21.42 and a s f value of -2.1 ppm/°C could be found for 0.95(Mg 0.98 Zn 0.02 )TiO 3 -0.05CaTiO 3 specimen with 4 wt% CBS glass addition sintered at 1240°C for 2 h. This study shows that appropriate addition of CBS glass could effectively decrease the sintering temperature of MZCT ceramics without deteriorating the ceramic performance.