The cobalt ferrite (CFO) powders were coated with zirconia via SolGel methods to form coreshell thin film. The Pb(Zn0.5W0.5)O3Pb(Cu0.5W0.5)O3 (PZWPCW) was used as additives to low down the sintering 〖HJ〗temperature of the lead lanthanum zirconate titanate (PLZT) ceramics. The CFO/PLZT 03 composite ceramics were fabricated from the mixture of the coated CFO and PLZT ceramic powder by using cofiring processes.The effects of the CFO content,phase structure, micro morphology and sintering conditions on the dielectric,piezoelectric and ferroelectric properties were investigated.The Xray and SEM diffraction results show that the ZrO2 layer can buffer the Fe3+ and Co2+ ions diffusing from CFO to PLZT during the sintering process.The composites presented the perovskite structure(PLZT) and the spinel structure(CFO) after relatively lower temperature sintering.The magnetoelectric coefficient of composite ceramics(CFO weight fraction x=0.2) which were sintered at 1 050 ℃ was found to be 401 mV/A at the magnetic field intensity of 334.23 A/m and frequency of 229 kHz.