Graphene　oxide　(GO)　fire　warning　sensors　have　received　much　attention　in　the　last　5　years.　However,　GO　sensors　still　suffer　from　a　high　response　temperature　(above　100　°C)　and　short　duration　time　of　fire　warning.　In　this　work,　an　asymmetric　nanocomposite　paper　based　on　color　and　resistance　switching　was　developed　to　overcome　these　issues.　The　top　surface　consists　of　poly(pentacosadiynoic　acid)　[poly(PCDA)]　and　hydroxyapatite　(HAp)　nanowires,　which　gives　the　alarm　by　a　color　change　from　purple　to　red　at　55　°C　due　to　the　conformational　distortion　of　the　poly(PCDA)　backbone.　On　the　other　hand,　the　bottom　surface　is　made　of　3-aminopropyltriethoxysilane　(APTES)-modified　GO　nanosheets　and　HAp　nanowires,　which　sends　out　alerts　within　1　s　in　fire　by　means　of　resistance　change　due　to　the　thermal　reduction　of　GO.　It　is　found　that　the　APTES　molecules　effectively　enhance　flame　retardancy　of　GO　by　releasing　nonflammable　gases　and　producing　a　protective　solid　barrier.　As　a　result,　long-lasting　fire　warning　has　been　realized.　©　2023　American　Chemical　Society.