Carbon　nanodots　(C-dots),　as　a　class　of　heavy-metal-free　fluorescent　nonmaterial　have　drawn　increasing　attention　due　to　their　strong　photoluminescence　(PL),　good　biocompatibility　and　low　toxicity.　Herein,　we　synthesize　nontoxic　fluorescent　C-dots　by　hydrothermal　treatment　of　the　mixture　of　glucose　and　taurine,　in　which　process　the　formation　and　the　surface　passivation　of　Cdots　take　place　simultaneously.　The　influence　of　reaction　temperature,　reaction　time　and　feed　ratio　of　glucose　to　taurine　on　the　PL　property　of　C-dots　is　studied.　As　the　C-dots　exhibit　sensitive　pH　and　iron　ion　dependent　PL　property,　they　can　be　used　for　pH　and　Fe3+　sensing　in　solutions.