A　series　of　poly(vinylidene　fluoride-chlorotrifluoroethylene)　(P(VDF-CTFE))/barium　strontium　titanate　(BST)　nanocomposites　were　fabricated　by　solution　casting　method.　The　addition　of　BST　nanoparticles　could　enhance　both　the　dielectric　constant　and　the　displacement　of　the　resultant　composite　significantly.　The　surface　activation　of　BST　nonaparticles　with　KH550　was　confirmed　as　an　effective　way　to　improve　the　breakdown　strength　of　the　composite.　The　high　electric　displacement　(D　＞　15　mu　C/cm(2)),　breakdown　field　(＞200　MV/m)　and　low　dielectric　loss　in　P(VDF-CTFE)/BST　nanocomposites　suggest　that　the　high　electrical　energy　density　may　be　desirable.　That　indicates　the　potential　application　of　this　class　of　copolymer/ceramics　nanocomposites　for　high　energy　storage　components.　(C)　2011　Elsevier　Ltd　and　Techna　Group　S.r.l.　All　rights　reserved.