Investigation　of　the　mechanical　properties　of　steel　rods　at　elevated　temperatures　is　important　for　the　fire-resistant　design　and　fire　simulation　analysis　of　steel　rod　structures.　In　China,　GLG650　denotes　a　steel　rod　whose　yield　strength　is　not　less　than　650　MPa.　A　35CrMo-GLG650　steel　rod　is　manufactured　with　35CrMo　alloy　structural　steel　using　quenching　and　tempering　methods.　To　investigate　the　mechanical　properties　of　35CrMo-GLG650　steel　rods　at　elevated　temperatures,　tensile　tests　of　four　specimens　are　performed　at　100　degrees　C,　200　degrees　C,　300　degrees　C,　400　degrees　C,　500　degrees　C,　600　degrees　C,　and　30　degrees　C.　The　test　results　show　that　the　35CrMo-GLG650　steel　rods　at　30　degrees　C　and　elevated　temperatures　exhibit　typical　nonlinear　characteristics　with　no　obvious　yield　plateau.　The　mechanical　properties　of　the　35CrMo-GLG650　steel　rods　at　elevated　temperature　are　obtained,　and　they　are　compared　with　those　of　other　high-strength　steels.　When　the　temperature　is　below　300　degrees　C,　the　reductions　in　the　mechanical　properties　of　the　specimens　are　approximately　0.9.　However,　the　mechanical　properties　of　the　specimens　change　significantly　when　the　temperature　exceeds　300　degrees　C.　At　600　degrees　C,　the　reduction　factors　of　the　yield　strength,　ultimate　strength,　and　elastic　modulus　are　0.56,　0.46,　and　0.45,　respectively.　In　this　paper,　equations　for　the　nominal　yield　strength,　elastic　modulus,　and　ultimate　strength　of　35CrMo-GLG650　steel　rods　at　elevated　temperatures　are　proposed.　Furthermore,　a　modified　two-stage　Ramberg-Osgood　model　for　35CrMo-GLG650　steel　rods　at　ambient　and　elevated　temperatures　is　proposed　that　can　act　as　a　reference　for　the　steel　rod　structure　at　elevated　temperatures.