Polyester-coated　fabric　has　been　widely　used　in　membrane　structures.　However,　the　mechanical　properties　of　polyester-coated　fabric　at　elevated　temperatures　have　not　been　well　studied,　limiting　its　applications　in　the　fire-resistant　analysis.　This　work　concerns　the　temperature　effects　on　the　mechanical　properties　of　the　polyester-coated　fabric　membrane　material　from　four　common　brands,　with　an　experimental　study　on　polyester-coated　fabric　specimens　at　23　degrees　C,　70　degrees　C,　100　degrees　C,　150　degrees　C,　200　degrees　C,　230　degrees　C,　and　250　degrees　C　under　uniaxial　loading,　respectively.　The　results　indicate　that　the　elastic　modulus　and　the　ultimate　tensile　strength　of　polyester-coated　fabric　membrane　material　decrease　with　temperature　increasing.　The　breaking　elongation　first　increases　and　then　decreases　with　increasing　temperature.　The　results　are　utilized　to　obtain　simple　empirical　equations　by　applying　membrane　structure　design　and　fire-resistant　analysis.　Change　laws　for　elastic　modulus,　ultimate　tensile　strength,　and　breaking　elongation　with　temperatures　are　proposed　as　equations;　the　constitutive　relation　of　polyester-coated　fabric　membrane　material　with　temperatures　is　also　fitted　by　one　two-stage　equation.　Of　considerable　significance　is　promoting　the　research　of　membrane　structure　design　and　fire-resistant　analysis.