Er3+/Yb3+　co-doped　Y2Ti2O7　(YTOEY)　nanobelts　with　a　thickness　of　similar　to　100　nm　are　synthesized　by　electrospinning,　which　exhibit　a　high　sensitivity　and　rapid　responsiveness　in　temperature　sensing.　The　fluorescence　intensity　ratio　of　two　green　intense　signals　that　originated　from　the　transitions　of　Er3+　ions　can　be　developed　for　non-contact　temperature　measurements.　Moreover,　the　nanoscale　dimensions,　porous　structures　and　large　surface　area　of　the　prepared　YTOEY　nanobelts　allow　the　photothermal　signals　to　pass　through　them　quickly.　The　maximum　absolute　sensitivity　at　513　K　and　the　extreme　relative　sensitivity　at　303　K　are　calculated　to　be　0.37%　K-1　and　1.17%　K-1,　respectively,　indicating　that　the　nanobelts　have　attractive　optical　temperature　sensing　characteristics.　These　extraordinary　results　demonstrate　that　YTOEY　nanobelts　are　a　promising　candidate　for　accurate　temperature　monitoring　in　thermo-sensitive　equipment.