Four　kinds　of　high　temperature　oxidation　resistant　iron-based　coatings　were　prepared　by　arc　spraying　process.　Oxidation　experiments　of　these　coatings　were　carried　out　at　800C　in　air　for　up　to　240　h.　The　morphologies,　composition,　and　phase　structures　of　the　oxidation　products　were　investigated　using　scanning　electron　microscopy　(SEM)　and　X-ray　diffraction　analysis　(XRD).　The　results　show　that　the　Cr　content　plays　an　important　role　in　the　oxidation　resistance.　When　the　Cr　content　contained　in　the　coating　is　more　than　40%　(mass　fraction),　a　continuous　Cr2O3　passivation　layer　is　developed　on　the　surface　of　the　coating,　leading　to　good　high　temperature　oxidation　resistance.　In　the　low　Cr-containing　coating,　e.g.,　lower　than　30%,　only　a　small　quantity　of　spinel　structured　FeCr2O4　was　formed　on　the　surface　of　the　coating,　which　provides　protection　to　the　substrate.　However,　most　of　the　oxidation　products　are　loose　structured　Fe2O3,　and　are　easy　to　spall　off,　resulting　in　a　poor　effect　in　substrate　protection.