Abstract: In order to reduce the sintering temperature of CaSiO₃ ceramic, by adding 1wt% Al₂O₃ and different amounts of V₂O₅ into CaSiO₃ powders, the effects of V₂O₅ additive amount on the sintering behavior, microstructure and microwave dielectric properties of CaSiO₃ ceramics were investigated. The results show that the appropriate addition of V₂O₅ can not only reduces the sintering temperature of V₂O₅-Al₂O₃/CaSiO₃ ceramics from 1 250 ℃ to 1 000 ℃, but also restrict the abnormal growth of CaSiO₃ ceramic grains and refine the ceramic grains. In the sintering process, V₂O₅ will melt and promote the densification process of CaSiO₃ ceramic by liquid phase wetting effect. At the same time, some of V₂O₅ will volatilize, and the non-volatilized V₂O₅ will react with the matrix material to form the second phase, and the emergence of the second phase reduces the quality factor of the ceramic substantially. Taking the sintering behavior and microwave dielectric properties into consideration synthetically, when V₂O₅ additive amount is 6wt%, the V₂O₅-Al₂O₃/CaSiO₃ ceramic sintered at 1 075 ℃ for 2 h has favorable comprehensive properties, the dielectric constant is 7.38 and the quality factor is 21 218 GHz.