In order to increase carbon recycling and reduce carbon emission, Ni, Ir and Cu with a mass percentage of 1% were impregnated on the cathode surface of solid oxide electrolysis cell named La0.55Sr0.45Fe0.85Mo0.15O3 (LSFM) by the impregnation method. The effect of impregnation on the electrocatalytic reduction of CO2 by parent perovskite was analyzed. The results indicate that compared with the LSFM cathode, the current density of the LSFM cathode with 1% of Ir (LSFM/Ir) is increased by 25% and its polarization resistance Rpis only 27% of that of the LSFM. The Ni-Fe nanoparticle alloy formed on the surface of the LSFM cathode with 1% of Ni (LSFM/Ni) can significantly improve the anti carbon deposition ability of the cathode.