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The influence of CuO addition on what of the (Ba,Sr)TiO3 ceramics was studied. The sintering temperature of (Ba,Sr)TiO3 ceramics was lowered by the addition of CuO additives. The 1 -5 wt% CuO were selected and employed as the sintering aids. Low-Temperature Co-fired Ceramic technologies are popular technologies used in the manufacture of microwave devices. In this study, crystalline and electrical properties of CuO doped (Ba,Sr)TiO3 ceramics were investigated to determine the low temperature sintering properties. The addition of CuO to (Ba,Sr)TiO3 lowered the sintering temperature from 1350℃ to 1150℃. The dependence of the sintering temperature shrinkage rate and mechanism of CuO doped (Ba,Sr)TiO3 ceramics are investigated and discussed. Also, the crystalline structure of CuOdoped (Ba,Sr)TiO3 ceramics is discussed by the X-ray diffraction (XRD) method.