Scintillation　materials　play　a　significant　role　in　the　exploration　of　extreme　space　environments　and　high-energy　physics.　Nevertheless,　due　to　the　prevalence　of　thermal　quenching,　most　traditional　scintillators　are　not　capable　of　stable　X-ray　imaging　at　high-temperature　working　mode.　In　this　work,　Ce3+　and　Tb3+　ions　are　successfully　co-doped　into　Cs2NaGdCl6　double　perovskites　(DPs)　via　a　solvothermal　method,　exhibiting　unusual　thermally　enhanced　scintillation　performance.　Specifically,　the　radioluminescence　intensity　of　Cs2NaGdCl6:Tb3+/Ce3+　increases　with　temperature　to　achieve　a　large　intensity　ratio　of　3.67　from　80　to　500　K.　Interestingly,　the　introduction　of　co-doped　ions　brings　the　dramatic　increase　of　thermoluminescence　intensity,　demonstrating　that　an　increased　number　of　deep　trap　results　in　the　suppression　of　the　thermal　quenching.　At　the　same　time,　the　extra　occurrence　of　deep　traps　can　be　traced　to　localized　octahedral　distortions　around　the　dopant　ions.　Moreover,　a　flexible　DP-based　scintillation　film　is　fabricated　by　a　direct　coating　method,　showing　thermally　enhanced　X-ray　imaging.　Ultra-stable　X-ray　imaging　performance　over　5　h　is　realized　under　a　high　temperature　of　380　K　by　the　scintillation　film.　The　results　provide　a　trap　regulation　strategy　for　exploring　novel　high-performance　and　stable　scintillators　at　high　temperatures.