A　sol-gel　based　coating　technology　was　utilized　to　improve　the　dielectric　properties　of　SrTiO3　(STO)　thick　films　based　on　crystalline@amorphous　core-shell　nanostructure.　In　this　route,　poly(vinyl　pyrrolidone)　(PVP)　was　used　as　the　surface　modification　agent　to　optimize　the　dispersibility　of　nanoparticles,　which　played　an　important　role　in　promoting　the　dielectric　homogeneity　in　the　nanocomposite　films.　The　crystalline@amorphous　structure　could　achieve　both　the　enhanced　dielectric　constant　and　high　breakdown　strength　because　the　external　amorphous　STO　matrix　shells　were　capable　of　undertaking　higher　applied　field　while　the　internal　STO　nano-crystalline　cores　supplied　more　polarization　charges.　Compared　with　the　amorphous　matrix,　the　dielectric　constant　of　the　modified　film　could　be　increased　from　15　to　46　under　the　precondition　of　maintaining　the　high　breakdown　strength　(170　MV/m).　Consequently,　the　calculated　energy　density　is　5.9　J/cm(3).　Furthermore,　based　on　the　electric　field　simulation　result,　it　can　be　concluded　that　interface　blocking　effect　created　by　the　amorphous　layers　and　reduced　electric　field　intensification　by　PVP　modification　led　to　the　enhancement　in　breakdown　strength.　(C)　2018　Elsevier　B.V.　All　rights　reserved.