0.7CaTiO3-0.3NdAlO3 (CTNA30) ceramics is a kind of widely used microwave dielectric ceramics with high sintering temperature. In this article, various contents of B2O3 were introduced into CTNA30 to decrease its sintering temperature. Then, the influences of B2O3 content on the sintering temperature, morphology, microstructure and microwave dielectric properties of CTNA30 were investigated with x-ray diffract meter (XRD), environmental scanning electron microscope (ESEM) and vector network analyzer. The results showed that ceramics could be sintered more easily when doped with B2O3. Moreover, the sintering temperature could be decreased to 1 300 ℃ from 1 500 ℃ when doped with 2wt% B2O3 and the corresponding εr reached the maximum 49.99, Qf about 57 862 GHz, which decreased with the increase of doping level, and τf was about 5.39×10-6∕℃