Process　of　self-growth　nanocrystalline　structure　was　explored　to　improve　the　dielectric　properties　of　amorphous　Sr0.925Bi0.05TiO3　(SBT)　thin　films　through　controlling　the　annealing　temperature.　The　crystallinity　of　the　material　was　15%　when　annealed　at　550　degrees　C,　and　the　resulting　nanocrystalline　particles　were　14　nm　in　size　as　determined　by　XRD　analysis.　Therefore,　the　proposed　process　could　produce　a　novel　film　of　an　amorphous　matrix　coating　nanocrystalline　particles.　Finite　element　analysis　results　showed　that　the　applied　electric　field　was　focused　primarily　in　the　amorphous　matrix,　which　could　effectively　decrease　the　probability　of　low　voltage　breakdown　of　the　nanocrystalline　particles.　Simultaneously,　the　nanocrystalline　particles　supplied　more　polarization　charges,　which　helped　to　improve　the　dielectric　constant　of　the　inorganic　composite.　Combining　the　merits　of　amorphous　and　crystalline　phases,　the　ultimate　energy　storage　density　of　the　modified　sample　was　as　high　as　21.2　J/cm(3),　which　represents　an　improvement　of　5.1　J/cm(3)　compared　with　that　of　pure　amorphous　SBT　thin　film.