The Li2Mg3TiO6 ceramics doped with ZnO-B2O3-SiO2 (ZBS)/Li2O-B2O3-SiO2 (ZBS) glass were synthesized through the conventional solid-state reaction route. The phase compositions, microstructures, sintering characteristics and microwave dielectric properties of Li2Mg3TiO6-xwt%ZBS and Li2Mg3TiO6-xwt%LBS (0 <= x <= 8) were investigated. With the increase of low-melting ZBS/LBS glass, the densification of Li2Mg3TiO6 ceramics was improved significantly through the mechanism of liquid phase sintering. The addition of ZBS/LBS glass could effectively lower the sintering temperature from 1350 degrees C to 1025 degrees C/1050 degrees C and had slightly influences on microwave dielectric properties of Li2Mg3TiO6 ceramics. The dielectric constant epsilon(r) and Q x f values correlated with bulk density strongly. The temperature coefficient of resonant frequency (tau(f)) was reduced by adding ZBS/LBS glass, due to the formation of the second phase MgSiO4. Compared with Li2Mg3TiO6-4wt%LBS sintered at 1050 degrees C, Li2Mg3TiO6 ceramics with 4 wt% ZBS glass sintered at 1025 degrees C had higher densification and more uniform grain morphology, which displayed excellent microwave dielectric properties of epsilon(r)similar to 13.35, Q x f similar to 138,800 GHz and tau(f)similar to-31.84 ppm/degrees C.