The addition of H2O can improve the conversion rate of CO(2 )electrolysis and facilitate the direct production of hydrocarbon fuels, thereby having a wide range of potential applications. An electrolyte-supported symmetrical solid oxide electrolysis cell (SOEC) has been fabricated by using 8% Y2O3 stabilized ZrO2 as electrolyte, Gd0.1Ce0.3O2-delta as buffer layer and novel perovskite La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-delta (LSCFN) material as the symmetrical electrodes. The results reveal that 15% steam can promote CO2 conversion and it significantly reduces polarization resistance of the cell. The current density can reach up to 0.638 A.cm (-2) @1.3 V and 850 degrees C with the composition of 75% CO2-15% H2O-10% H-2(.) The outstanding stability of the cell performance has been demonstrated under different current densities up to 0.5 A.cm(-2) and operating durations up to 110 h at 0.4 A.cm(-2). Overall, LSCFN is a highly-efficient and extremely-stable electrode material for symmetrical SOEC application.