Sulphur　poisoning　for　state-of-the-art　La0.8Sr0.2MnO3-δ　(LSM)　anodes　of　solid　oxide　electrolysis　cell　(SOEC)　was　studied　under　anodic　current　of　200　mA/cm2　in　1　ppm　SO2　air.　After　polarization　in　1　ppm　SO2-containing　air　at　800　°C　for　40　h,　electrode　polarization　resistance　as　well　as　ohmic　resistance　of　LSM　electrodes　were　measured　24.83　cm2　and　6.09　cm2,　which　were　around　4　as　well　as　3　times　than　initial　values　of　LSM　electrodes.　Sulphur　deposition　prefers　to　take　place　at　the　LSM/YSZ　interface　and　inner　layer　for　LSM　electrodes,　leading　to　the　formation　of　SrSO4　compounds,　which　is　confirmed　by　XRD　and　then　leads　to　the　microstructural　change　of　the　LSM　electrodes.　The　anodic　polarization　promotes　the　SrO　segregation,　which　is　supported　by　the　observation　of　the　deposition　of　SrSO4　compounds,　accelerating　LSM　electrodes　delamination.　The　results　indicate　the　obvious　poisoning　effect　for　sulphur　species　of　electrochemical　activity　as　well　as　stability　of　SOEC　electrodes.　©　2018　Elsevier　Ltd