With　the　increasing　demands　of　X-ray　detection　and　medical　diagnosis,　organic　scintillators　with　intense　and　tunable　X-ray　excited　emission　have　been　becoming　important.　To　guarantee　the　X-ray　absorption,　heavy　atoms　were　widely　added　in　reported　organic　scintillators,　which　led　to　emission　quenching.　In　this　work,　we　propose　a　new　strategy　to　realize　organic　scintillators　through　the　host-guest　doping　strategy.　Then　the　X-ray　absorption　centers　(host)　and　emission　centers　(guest)　are　separated.　Under　X-ray　excitation,　these　materials　displayed　intense　and　readily　tunable　emissions　ranging　from　green　(520　nm)　to　near　infrared　(NIR)　regions　(682　nm).　Besides,　the　relationship　between　the　X-ray　absorption　and　spatial　arrangement　of　the　heavy　atoms　in　the　host　matrix　was　also　revealed.　The　potential　application　of　these　wide-range　color　tunable　organic　host-guest　scintillators　in　X-ray　imaging　were　demonstrated.　This　work　provides　a　new　feasible　strategy　for　constructing　high-performance　organic　scintillators　with　tunable　luminescence　properties.　A　new　strategy　to　achieve　organic　scintillators　through　constructing　host-guest　doping　system　was　demonstrated.　When　doping　guest　materials　with　different　triplet　state　energy　levels,　readily　tunable　emissions　ranging　from　green　(520　nm)　to　near　infrared　(NIR)　regions　(682　nm)　were　achieved　under　X-ray　excitation.　The　developed　system　also　enabled　color-tunable　NIR　X-ray　imaging　and　provided　a　convenient　visualization　tool　for　X-ray　radiography.image