Polypropylene　fibers　improve　the　toughness　of　concrete　and　reduce　the　susceptibility　of　high-strength　concrete　(HSC)　to　high　temperature　spalling.　And　the　mechanical　properties　of　polypropylene　fiber　reinforced　concrete　(PFRC)　become　important　after　exposure　to　high　temperatures,　especially　in　situations　related　to　engineering　uses　or　repairing　concrete　structures　damaged　by　fire.　This　paper　presents　an　experimental　study　on　the　compressive　strength　and　fracture　properties　of　PFRC　experiencing　different　temperatures　with　different　fiber　contents　and　lengths.　It　was　shown　that　the　fracture　path　of　concrete　becomes　longer　after　experiencing　high　temperatures.　The　rate　of　debonding　of　mortar　and　coarse　aggregate　increases　with　the　temperature　rising.　The　compressive　strength　of　concrete　and　the　peak　load　and　fracture　energy　of　three-point　bending　beams　were　both　increased　by　the　addition　of　polypropylene　fibers　at　room　temperature,　and　the　compressive　strength　increased　with　the　increase　of　fiber　content.　The　addition　of　polypropylene　fibers　is　able　to　increase　the　compressive　strength　of　concrete　compared　to　the　control　group　at　experiencing　temperatures　less　than　300　oC.　The　peak　forces　of　the　three-point　bending　of　the　concrete　beams　all　show　a　decreasing　trend　with　the　increase　in　the　experienced　temperature.　The　initial　slopes　of　the　rising　part　of　the　force-loading　point　displacement　and　force-crack　mouth　opening　displacement　(CMOD)　curves　all　decrease　with　increasing　of　temperature,　and　curves　gradually　become　slower.　Addition　of　polypropylene　fibers　decreases　the　peak　force　of　concrete　after　high　temperature.　There　is　no　significant　pattern　in　the　effect　of　polypropylene　fiber　content　and　length　on　the　peak　force　and　fracture　energy　of　concrete　three-point　bending　beams.　©　2024