Dielectric　composite　films　of　the　micro-nanosize　BaTiO(3)　(BT)　particles　embedded　into　a　polyvinylidene　fluoride　(PVDF)　matrix　were　prepared　by　using　a　simple　blending　and　casting　processing.　Effects　of　the　micro-nanosize　cofilled　model　at　different　mciro-nanosize　volume　ratios　of　BT　particles　on　microstructure　and　dielectric　properties　of　the　composite　films　were　researched.　The　results　show　that　the　nanosize　BT　particles　can　be　filled　into　the　gaps　between　the　micron-size　BT　particles　so　that　a　tightly　stack　structure　in　the　BT/PVDF　composite　film　is　formed.　As　a　result,　the　dielectric　properties　of　the　composite　films　with　the　micro-nanosize　BT　loading　at　40　vol%　is　higher　than　these　with　single　nanosize　BT　loading　solely　if　the　interactions　between　the　BT　fillers　are　considered.　The　maximum　values　of　dielectric　permittivity　were　about　55　because　of　the　superior　internal　microstructure　of　composite　films　when　the　mciro-nanosize　volume　ratio　of　BT　particles　is　close　to　1/1.　In　this　case,　a　remarkable　synergistic　effect　for　improving　the　dielectric　properties　was　also　observed.　The　microstructure　and　the　assumed　cofilled　model　of　the　composite　films　would　used　to　explain　the　experimental　results　well.