Covalent　organic　frameworks　(COFs)　represent　an　emerging　class　of　two-or　three-dimensional　crystalline　porous　materials　with　delicate　control　over　topology,　composition,　and　porosity.　Here,　we　develop　a　new　COF　made　up　of　1,3,6,8-tetrakis(p-formylphenyl)pyrene　(TFPPy)　and　4,4′-diaminobenzophenone　(DABP)　that　exhibits　a　rare　one-dimensional　(1D)　structure.　The　resulting　frameworks　possess　good　crystallinity,　comparatively　high　Brunauer-Emmett-Teller　(BET)　surface　area　(426　m2/g),　and　good　thermal　stability　(360　°C).　Impressively,　this　1D　COF　shows　strong　fluorescence　and　can　be　used　as　an　excellent　H+　sensor　in　an　acidic　aqueous　solution.　©