Iron-based　catalysts　are　promising　for　the　catalytic　oxidation　of　H2S　owing　to　their　non-toxicity,　abundance,　and　high　conversion　efficiency.　However,　their　industrial　applications　are　hampered　by　the　low　selectivity　and　poor　durability.　Herein,　we　reported　a　simple　one-step　pyrolysis　approach　to　synthesize　isolated　Fe-N　chi　sites　confined　in　graphitic　carbon　nitride　(Fe-CN-NH　chi).　The　creation　of　isolated　Fe-N　chi　sites　was　evidenced　by　aberrationcorrected　high-angle　annular　dark-field　scanning　transmission　electron　microscopy　(HAADF-STEM),　X-ray　absorption　spectroscopy　(XAS),　UV-vis-NIR　diffuse　reflectance　spectroscopy　(DRS),　and　X-ray　photoelectron　spectroscopy　(XPS).　The　well　dispersed　Fe-N　chi　sites　offer　additional　active　centers　for　the　reaction,　and　such　form　of　Fe　presence　effectively　resists　the　deep　oxidation　of　H2S.　As　a　result,　the　obtained　Fe-CN-NH5　catalyst　exhibited　outstanding　catalytic　performance　with　high　sulfur　selectivity.　Significantly,　the　Fe-N　chi　sites　are　resistance　to　sulfur　poisoning,　leading　to　excellent　durability　in　the　reaction.　No　obvious　decrease　of　catalytic　activity　was　observed　in　a　reaction　period　of　180　h,　which　is　better　than　those　of　reported　iron-based　catalysts.