In　this　paper,　a　three-dimensional　microscopic　model　of　the　solid　oxide　fuel　cell　(SOFC)　anode　is　established　based　on　the　SOFC　anode　microstructure　reconstructed　by　Nano-CT,　and　the　characterization　parameters　of　the　electrode　are　calculated.　The　electrochemical　reaction　is　defined　on　the　three-phase　boundaries　of　the　microstructure,　and　the　polarization　characteristic　at　different　temperatures　is　explored.　Results　show　that　the　anode　polarization　loss　increase　with　the　increase　of　temperature.　The　activation　loss　and　the　ohmic　loss　are　of　the　same　magnitude　and　occupy　the　main　part　of　the　total　polarization　loss.　The　pore　microstructure　directly　affects　the　gas　transfer　in　the　anode,　and　there　is　a　large　mass　transfer　resistance　in　the　small　throat,　which　causes　obvious　concentration　polarization　loss　and　affects　the　activation　loss.　Due　to　the　uneven　microstructure,　the　electrochemical　reaction　rate　of　the　electrodes　at　the　same　depth　is　not　consistent.　The　closer　to　the　electrode-electrolyte　interface,　the　more　obvious　the　unevenness　of　activation　polarization　and　concentration　polarization.　©　Published　under　licence　by　IOP　Publishing　Ltd.