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NaNbO 3 (NN) ceramics are promising candidate materials for capacitors, where dielectric properties are crucial for application in complex circumstances. However, conventional sintering requires several hours for the sintering process, which is not only inefficient but also results in significant energy consumption. In this study, NN ceramics with a relative density of 95% and smaller grain size were obtained using an ultrafast high-temperature sintering (UHS) at 1100 °C for 60 s. The dielectric constant of NN ceramics at 1 KHz keeps at 1460.52, with a low dielectric loss. And UHS technique refines the grains and prevents the volatilization of Na for a very short time, which is because it bypasses the necking stage and effectively prevents grain coarsening. This novel technique provides a simple and efficient technical support to obtain dielectric materials. [ABSTRACT FROM AUTHOR]