The prepared Li2O?Bi2O3 was added to Pb(Mg1/3Nb2/3)0.65Ti0.35O3 (0.65PMN-0.35PT) piezoelectric ceramic synthesized by the columbite method to examine its effect on the microstructure, crystallinity, and piezoelectric properties of the sintered body for the fabrication of multi-layered actuator. The ceramic powder was prepared into slurries, followed by tape-casting. Copper (Cu) electrode paste was printed on the surface of green sheet. The laminated green body was made to an multi-layered actuator. The oxygen partial pressure was controlled during co-firing in the reduced atmosphere. The sintered density and the piezoelectric properties were examined, and the inter-diffusivity between copper electrode and ceramic substrate was also examined. The highest density of 0.65PMN-0.35PT was 7.93 g/㎤, when it was sintered at 1200℃ in air. The addition of Li2O?Bi2O3 could lower the sintering temperature from 1200℃ to 950℃. The sintered density obtained at 950℃ with Li2O?Bi2O3 addition of 3 weight % was 7.92 g/㎤, and the piezoelectric constant (d33) was 596 pC/N, and the electro-mechanical coupling coefficient (Kp) was 57 %. The largest strain at the electrical field of 3.0kV was 0.129 % with the amount 3 weight % of Li2O?Bi2O3. The strain decreased with the amount of 5 weight %. The Curie temperature (Tc) was 138.6℃ at 1 ㎑. The Li2O?Bi2O3 addition of 5-7 weight % led the crystalline transformation from tetragonal to rhombohedral, identified by x-ray diffraction (XRD) analysis. The adoption of Cu electrode is known to need co-firing in a reduced atmosphere, but this make the binder burn-out (de-binding) incomplete. For more complete de-binding, two-step de-binding was performed. The prepared green body was fired to 300℃, and suspended for 10 hours in air atmosphere at first. This made the removal of 92.5% (6.06 weight % absolutely) organic materials to make more complete 2nd de-binding in a reduced atmosphere. The 2nd de-binding was performed with wet N2 atmosphere at 600℃ for 10 hours. In detail, the monitored logPO2 was kept at ?4.3, which made additional organic removal of 0.43 weight % (6.49 weight % in total, 99.1 % of the calculated amount). Though the more the oxygen partial pressure, the more complete the de-binding, it would make the oxidation of Cu electrode. With the oxygen partial pressure of logPO2 of ?4.3, the sintered density was 7.52 g/㎤, and the electrical resistance of Cu internal electrode was 0.6 Ω. From microstructure observation, the stable interface between Cu metal and 0.65PMN-0.35PT ceramic was confirmed. No remarkable inter-diffusivity was found. The largest displacement with the voltage 300 V was 1.2 ㎛ with the oxygen partial pressure of logPO2 = -4.3 (the thickness of the multi-layered actuator was 1 ㎜). It was confirmed that Cu electrode was feasible for the multi-layered actuator of 0.65PMN-0.35PT with 3 weight % of Li2O?Bi2O3.