Abstract: By using the method of doping nano barium titanate and manganese carbonate，the changes in microstructure and morphology of the surface of ceramics sintered from barium titanate blank doped with different contents of barium titanate and manganese carbonate were observed.The effects of single doped nano barium titanate，single doped manganese carbonate， and compound-doped manganese carbonate+nano titanate barium on the ceramic grain size and dielectric properties of ceramics were also studied. Results showed that：the dielectric properties of barium titanate ceramic products doped with nano barium titanate have improved significantly，but with the further increase of the doping amount，little change in its dielectric properties；the refinement effect of barium titanate ceramics grain doped with manganese carbonate was better than that of doped nano barium titanate；the density of ceramics doped with composite 1%（mass fraction，the same below） manganese carbonate+1% nano barium titanate was higher than that of doped with 1% single manganese carbonate.

Key words: barium titanate, manganese carbonate, ceramics