Abstract: A novel nano-doping process was int roduced for the preparation of Ba TiO₃-based ult rafine nonreducibledielect rics for multilayer ceramic capacitance (MLCC) . According to TG-DTA , XRD and TEM analysis , the nano-dopant prepared by the water-based sol-gel method was well dispersive and active. The nano-doping mechanism wasinvestigated based on comparing conventional process with nano-doping process. It indicated that due to the specialnano-effect , the modification effect of foreign atom was improved effectively and the microst ructure and macro dielect ric characteristics of so acquired ceramics were improved consequently. The result s show that high performancedielect rics are obtained , with permittivity more than 2800 , dielect ric loss lower than 110 % and average grain size about 0.3μm , which satisfies the requirement s of EIA X7R/ X8R specifications.