This　paper　presents　an　experimental　investigation　on　the　residual　mechanical　properties　and　microstructure　of　carbon　fiber　reinforced　concrete　(CFRC)　after　high　temperatures.　Seven　different　concrete　mixtures　with　various　carbon　fiber　contents　and　carbon　fiber　lengths　were　prepared.　The　effects　of　carbon　fiber　contents　and　carbon　fiber　lengths　on　the　compressive,　flexural,　and　splitting　strength　of　CFRC　after　high　temperatures　were　systematically　reported　and　analyzed.　Besides,　the　microstructure　and　carbon　fiber　failure　mode　of　the　fracture　plane　of　CFRC　were　observed　by　scanning　electron　microscopy　(SEM).　Experimental　results　demonstrate　that　the　addition　of　carbon　fibers　can　effectively　improve　the　flexural　and　splitting　strength　of　CFRC,　while　the　enhancement　amplitude　of　compressive　strength　is　quite　limited.　The　optimum　dosages　of　carbon　fiber　contents　and　carbon　fiber　length　are　1.0　wt%　and　10　mm,　respectively,　in　terms　of　the　mechanical　properties　of　CFRC　after　high　temperatures.　The　carbon　fiber　contents　exert　the　largest　influence　on　the　flexural　strength　of　CFRC,　followed　by　the　splitting　and　compressive　strength.　However,　the　carbon　fiber　length　negligibly　influences　the　compressive,　flexural,　and　splitting　strength　of　CFRC.　The　residual　ratios　of　compressive,　flexural,　and　splitting　strength　of　CFRC　after　high　temperatures　primarily　depend　on　the　rising　temperature.　The　SEM　results　show　that　the　failure　mode　of　CFRC　under　loading　is　mainly　the　breakage　and　pullout　of　the　carbon　fiber.