Solid oxide fuel cell is the device that converts the chemical energy in fuel to the electrical energy directly with high efficiency. Cation ordered perovskite-related oxides, NdBaCo2O5+δ(NBCO), is known as one of the best cathode materials for intermediate-temperature solid oxide fuel cell(IT-SOFC) because of its rapid oxygen diffusion and surface exchange kinetics and high electrical conductivity. The purpose of redox characteristics is to identify the above properties of the NdBaCo2O5+δ as a candidate for IT-SOFC cathode material with the appropriate experimental techniques, such as XRD, 4-probe conductivity, and coulometric titration(CT). Thermodynamic redox characteristics including oxidation enthalpies and entropies were studied by the CT. The isotherms were obtained at 650, 700 and 750℃ over a broad range of pO2. Oxygen non-stoichiometry has shown that higher temperature lead more reduction of the NBCO at the same pO2 region, involving that its decomposition at 750℃ occurred near the pO2 of 10-5atm, but it was not detected at 650℃ within the operational range of the SOFC cathode (pO2 of 10-5atm). Therefore, the NBCO may not be suitable for the cathode of SOFC above operating temperature of 750℃ due to the decomposition. The oxidation enthalpies increased quite a lot even with small change in the reduction state, which were -338.2 kJ/mol-O2 and -506.0 kJ/mol-O2 at δ=0.412 and 0.392, respectively. Also the oxidation entropies were determined as -305.3 J/mol-O2/K and -469.0 J/mol-O2/K at δ=0.412 and 0.392, respectively. The electrical conductivities were measured by 4-probe method over a broad range of pO2. This material indicated sufficiently high conductivities for IT-SOFC cathode application.