The　freeze-thaw　resistant　performance　of　a　tunnel　fireproof　coating　(TFC)　has　an　important　impact　on　bonding　property　and　durability.　The　influence　of　redispersible　emulsion　powder,　polypropylene　fiber　and　air-entraining　agent　on　TFCs　was　studied.　Transverse　fundamental　frequency　and　ultrasonic　sound　velocity　were　used　to　evaluate　the　damage　degree　of　TFC,　and　the　mechanism　was　revealed　by　SEM　and　pore　structure.　The　results　show　that　the　most　beneficial　effect　on　bond　strength　of　TFC　is　redispersible　emulsion　powder,　followed　by　air-entraining　agent,　and　then　polypropylene　fiber.　After　freeze-thaw　cycles,　the　cumulative　pore　volume　of　micropores　in　the　TFC　increases　obviously,　while　the　porosity　of　macropores　does　not　change　significantly.　A　prediction　model　was　proposed,　which　can　calculate　the　bond　strength　from　the　damage　degree　of　TFC　under　freeze-thaw　cycles.　The　achievement　can　promote　the　application　of　TFC　in　cold　regions.