The　high-temperature　mechanical　properties　of　310S　stainless　steel　were　investigated　by　uniaxial　tensile　tests　and　small　punch　tests　at　the　temperature　from　20celcius　to　600celcius,　and　the　relationship　between　the　mechanical　properties　(sigma　YS　,sigma　UTS)　and　the　characteristic　loads　(Fy,　Fm)　was　established.　The　results　revealed　that　with　increasing　temperature,　the　mechanical　properties　of　310S　decrease,　and　the　characteristic　loads　obtained　by　Fy_Mao,　Fy_EN　and　Fy_E3205　are　more　appropriate　for　determining　the　yield　strength　of　materials　at　high　temperatures　particularly　for　Fy_E3205.　The　fracture　pattern　observed　in　the　SPT　specimens　indicated　a　mixed　tough-brittle　fracture　accompanied　by　the　characteristics　of　cleavage　fracture.　Additionally,　the　ultimate　tensile　strength　of　the　material　and　the　maximum　load　Fm　increased　slightly　at　400　celcius　compared　to　300　celcius　due　to　the　precipitation　of　a　large　number　of　granular　carbides　and　the　increase　in　the　grain　size.