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The electrochemical conversion of carbon monoxide (CO) to value-added chemical products is promising for carbon utilization and CO removal. Herein we explored the potential of two-dimensional metal-embedded polyphthalocyanines (MPPcs) for electro-catalytic CO reduction reaction (CORR) by computational approach. The CrPPc, MnPPc, CoPPc, and MoPPc are initially screened out as the candidates. Then the optimal reaction pathways and corresponding potential determining steps (PDS) are determined by calculating free energies of all the possible intermediates. Based on our results, the CrPPc, MnPPc, and MoPPc could efficiently reduce CO into methane (CH4), among which the CrPPc exhibits the highest performance.