Taking BaBi10B6O25 as the liquid phase sintering assistants，the effects of BaBi10B6O25 doping on the sintering, phase compositions，microstructure morphology and dielectric properties of CaZrO3 ceramics were investigated. The result indicated that BaBi10B6O25 could be used as sintering assistants to reduce the sintering temperature of CaZrO3 ceramics from 1 500 ℃ to 1 000 ℃ without second phase formation. When the mass fraction of BaBi10B6O25 was 7.5%, a high relative density of 98% and good dielectric properties of εr=28,Q·f=8 872 GHz,τf=21×10-6/℃ were obtained for the CaZrO3 ceramics sintered at 1 000 ℃ for 3 h.