This study reports a new, simple and effective pre-calcined method for fabrication BaO-TiO2-B2O3-SiO2 low temperature cofired ceramics (LTCC) at a sintering temperature below 900 degrees C, and with dielectric losses (tan delta) lower than 2 x 10(-3). The research results have shown that the addition of 2-5 wt% Al2O3 could easily eliminate the porosity of the glass-ceramics because of the excellent wetting behavior between alumina and the BaO-B2O3-SiO2 glass liquid phase in the low temperature co-fired ceramic system. (C) 2007 Elsevier Ltd. All rights reserved.