Galfan-coated　steel　cables　are　widely　used　in　prestressed　structures　due　to　their　excellent　mechanical　properties　and　corrosion　resistance.　Their　postfire　mechanical　properties　are　important　to　evaluate　the　residual　load-bearing　capability　of　the　structures　after　fire.　However,　the　research　on　the　postfire　mechanical　properties　of　Galfan-coated　steel　cables　is　stillscarce,　especially　the　cable　in　stress　state.　Hence,　a　research　based　on　experimental　study　was　carried　out　to　investigate　the　deterioration　of　mechanical　properties　of　Galfan-coated　steel　cables　in　stress　state　after　experiencing　elevated　temperatures　in　this　paper.　Eighteen　tensile　tests　were　conducted　on　specimens　exposed　to　elevated　temperatures　varying　from　100　degrees　C　to　500　degrees　C　and　then　cooled　down　to　ambient　temperature　in　air.　Both　twisting　characteristic　and　constant　stress　level　of　Galfan-coated　steel　cables　were　considered　in　this　study.　The　residual　nominal　yield　strength,　ultimate　strength,　elastic　modulus,　fracture　strain,　and　stress-strain　curves　of　Galfan-coated　steel　cables　after　experiencing　elevated　temperatures　were　obtained　and　compared　with　the　existing　researches.　The　results　show　that　the　postfire　mechanical　properties　are　obviously　decreased　when　the　fire　temperature　exceeds　300　degrees　C.　Equations　for　the　residual　nominal　yield　strength,　elastic　modulus,　ultimate　strength,　and　fracture　strain　of　the　Galfan-coated　steel　cables　were　proposed.　Furthermore,　a　modified　two-stage　Ramberg-Osgood　model　for　Galfan-coated　steel　cables　after　experiencing　elevated　temperatures　was　established,　which　can　provide　reference　for　the　safety　assessment　and　repairment　of　prestressed　structures　after　fire.