Hydrogen　sulfide　(H2S)　corrosion　resistance　at　600°C　of　Al-based　coating　prepared　by　arc　spraying　was　investigated　and　compared　with　A304　stainless　steel　and　Fe-Al　coating.　The　results　show　that　the　Al-based　coating　has　the　best　hydrogen　sulfide　corrosion　resistance　among　the　three　kinds　of　coatings.　The　reason　is　that,　because　of　the　high　Al　content　of　the　Al-based　coating.　Aluminous　corrosion　products　are　prior　to　form　and　the　coating　includes　various　aluminous　intermetallic,　which　prevent　the　sulfur　from　penetrating　to　the　inner　coating,　resulting　in　excellent　hydrogen　sulfide　corrosion　resistance　property.