For　electrocatalytic　reduction　of　CO2　to　CO,　the　stabilization　of　intermediate　COOH*　and　the　desorption　of　CO*　are　two　key　steps.　Pd　can　easily　stabilize　COOH*,　whereas　the　strong　CO*　binding　to　Pd　surface　results　in　severe　poisoning,　thus　lowering　catalytic　activity　and　stability　for　CO2　reduction.　On　Ag　surface,　CO*　desorbs　readily,　while　COOH*　requires　a　relatively　high　formation　energy,　leading　to　a　high　overpotential.　In　light　of　the　above　issues,　we　successfully　designed　the　PdAg　bimetallic　catalyst　to　circumvent　the　drawbacks　of　sole　Pd　and　Ag.　The　PdAg　catalyst　with　Ag-terminated　surface　not　only　shows　a　much　lower　overpotential　(-0.55　V　with　CO　current　density　of　1　mA/cm(2))　than　Ag　(-0.76　V),　but　also　delivers　a　CO/H-2　ratio　18　times　as　high　as　that　for　Pd　at　the　potential　of　-0.75　V　vs.　RHE.　The　issue　of　CO　poisoning　is　significantly　alleviated　on　Ag-terminated　PdAg　surface,　with　the　stability　well　retained　after　4　h　electrolysis　at　-0.75　V　vs.　RHE.　Density　functional　theory　(DFT)　calculations　reveal　that　the　Ag-terminated　PdAg　surface　features　a　lowered　formation　energy　for　COOH*　and　weakened　adsorption　for　CO*,　which　both　contribute　to　the　enhanced　performance　for　CO2　reduction.