Sintering behavior and dielectric performance of yttria/silica-coated BaTiO3 powders (YSBT) with the addition of Mn-Si-O glass (0-0.5 wt%) were investigated. The sample made with YSBT powder of 0.35 mu m average particle size was fully sintered at 1300 degrees C in 1 h, and further lowered to 1200 degrees C with 0.2 wt% glass addition. The average grain size and secondary phases of sintered BaTiO3 were characterized with XRD and TEM analyses. The resulted dielectric properties, dielectric constant, dielectric loss, and temperature-capacitance characteristic, have been examined in air or reduced atmosphere, and discussed corresponding to microstructural features.