A　reflection　heat　source　including　a　radiator　as　well　as　an　aluminum　plate　is　designed,　and　the　temperature　field　of　the　aluminum　plate　is　used　as　the　tested　object.　The　reflection　lensless　Fourier　transform　(LFT)　digital　holography　is　performed　to　measure　the　temperature　field　distribution.　For　the　comparison,　the　temperature　measurement　system　within　the　radiator　is　used　to　measure　the　temperature　distributions.　The　results　obtained　by　these　two　methods　are　in　good　agreement,　which　demonstrates　that　the　digital　holography　method　is　valid　for　the　measurement　of　the　temperature　distribution.