Nowadays,　dielectric　materials　with　high　energy　storage　density　play　a　vital　role　in　the　energy　storage　capacitors.　To　increase　the　storage　density,　0-3　composite　films　based　on　poly(vinylidene　fluoride-co-chlorotrifluoroethylene)　[P(VDF-CTFE)]　and　silicon　dioxide　(SiO2)　nanoparticles　were　prepared　by　a　solution　casting　method.　The　composite　with　10%　SiO2　has　a　discharged　energy　density　of　2.73　J/cm(3)　at　200　MV/m.　Furthermore,　the　local　electric　field　distribution　in　the　P(VDF-CTFE)/SiO2　nanocomposites　was　analyzed　by　experiments　combined　with　model　simulation.　And　the　relationship　of　displacement　(D)　and　remanent　polarization　(P-r)　with　the　current　at　the　applied　electric　field　was　investigated.　It　indicates　that　during　the　charging　phase,　a　large　positive　(+)　current　value　is　conducive　to　obtaining　high　electrical　displacement　while　in　the　discharge　phase,　a　small　negative　current　value　will　be　beneficial　to　achieve　a　smaller　remanent　polarization　value.　Therefore,　the　addition　of　low　dielectric　permittivity　fillers　(SiO2)　contributes　to　the　displacement　of　the　composite　at　higher　electric　fields　and　maintains　the　P-r　in　a　small　range,　thus　achieving　a　higher　discharged　energy　density.