Combined　chromium　and　sulfur　poisoning　for　La0.8Sr0.2MnO3-δ　(LSM)cathodes　of　solid　oxide　fuel　cells　(SOFCs)were　investigated　with　cathodic　current　of　200　mA　cm−2　under　800　°C　for　22　h.　After　polarization　in　chromium　and　sulfur　at　800　°C　for　22　h,　polarization　and　ohmic　resistance　for　LSM　electrodes　were　5.1　cm2　and　7.62　cm2,　which　were　larger　than　values　of　LSM　electrodes　after　chromium　deposition　only　and　sulfur　deposition　only.　EDS,　XPS　and　XRD　results　showed　chromium　and　sulfur　deposition　occurred　especially　in　bulk　of　the　electrode,　forming　SrCrO4　and　SrSO4.　Compared　with　chromium　deposition　only,　sulfur　deposition　only,　combined　chromium　and　sulfur　deposition　was　not　random　and　the　degradation　phenomenon　of　chromium　and　sulfur　poisoning　was　much　more　severe.　The　combined　chromium　and　sulfur　deposition　of　LSM　electrodes　was　induced　by　interaction　among　CrO,　SO2　and　segregated　SrO　from　LSM　electrode.　Thermodynamic　predictions　have　been　carried　out　utilizing　CALPHAD　approach,　which　were　found　in　agreement　with　observed　experimental　results.　©　2019　Elsevier　Ltd