通过对粒径均匀分布的细晶粒纯ＢａＴｉＯ３陶瓷介电性能研究发现，陶瓷的介电常数和介电损耗随晶粒粒度发生明显变化．随晶粒的减小，相变弥散，Ｃｕｒｉｅ温度降低，介电常数和介电损耗减小．平均晶粒度２８０ｎｍ的样品具有高的室温介电常数，部分晶粒仍保持铁电相结构是导致高介电常数的原因． Through the study on the dielectric properties of fine-grained pure BaTiO3 ceramics with uniform particle size distribution, it is found that the dielectric constant and dielectric loss of the ceramics change obviously with the grain size. As the grain size decreases, the phase transition disperses, the Curie temperature decreases, and the dielectric constant and dielectric loss decrease. Samples with an average grain size of 280 nm have a high dielectric constant at room temperature, and some of the grains retain the ferroelectric phase structure leading to a high dielectric constant.