Recently,　graphene　oxide　(GO)-based　fire　alarm　systems　have　been　well　developed　due　to　their　rapid　response　to　the　flame.　However,　the　GO-based　fire　alarm　systems　still　suffer　from　low　thermal　stability　and　mechanical　fragility　in　the　flame,　resulting　in　a　short　alarm　time　and　unreliable　warning.　Herein,　we　have　developed　a　composite　paper　composed　of　polyethyleneimine　(PEI)-modified　GO　and　hydroxyapatite　(HAP)　nanowires.　The　results　demonstrate　that　PEI　molecules　are　powerful　to　improve　thermal　stability　and　flame　retardancy　of　GO　and　thus　increase　alarm　time,　while　HAP　nanowires　with　intrinsic　nonflammability　act　as　a　stable　fire-resistant　framework　to　ensure　the　structural　integrity　of　the　composite　paper　after　fire　attacking.　As　a　result,　the　GO/PEI/HAP　composite　paper　shows　the　continuous　fire　warning,　and　particularly,　maintains　its　mechanical　strength　mostly　and　high　flexibility　after　fire　attacking.　This　work　provides　an　instructive　guideline　to　design　reliable　GO-based　fire　alarm　systems.　©　2022　Elsevier　Ltd