We　investigate　in　this　paper　the　influence　of　the　localized　plasmon　resonance　of　gold　nano-island　structure　on　the　photoluminescence　of　the　exciplex　in　the　polymer　blends.　The　experimental　results　show　that　when　the　particle　plasmon　resonance　overlaps　the　photoluminescence　spectrum　of　the　exciplex,　the　corresponding　emission　intensity　is　enhanced　significantly.　Furthermore,　a　longer　lifetime　is　observed　with　the　exciplex　emission.　We　propose　that　the　localized　electrical　field　induced　by　the　particle　plasmon　resonance　increaseds　the　exciton　diffusion　length　and　thus　conduces　to　the　formation　of　the　exciplex　in　the　phase　separation　interface.