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In this paper, barium retinae@ polyaniline-ferroferncoxide ( BT@PANI-Fe3 O4 ) core-shell particles were prepared by oxidation precipitation method, and the polyvinyiidene fluoride (PVDF) dielectric composts were prepared with this filler. The effect of the mass ratio of ferrous ammonium sulfate (FAS) to BT@PANI core-shell particles on the dialectic properties of the composts was investigated. The results showed that the dielectric constant of the composts increased with increasing mass ratio of FAS to BT@PANI in the frequency range. The dielectric constant of BT@PANI-Fe3 O4 /PVDF composts reached 14 (100 Hz) when the mass ratio of FAS to BT@PANI core-shell (Dates was 1 = 1, compared with BT@PANI/PVDF composites (12, 100 Hz), and the dielectric constant was improved and the dielectric loss remained around 0.1. At high frequency, the BT@PANI-Fe3O4/PVDF dielectric loss (0.03, 104 Hz) was lower than that of BT@PANI/PVDF (0.09, 1 04 Hz) composts, which satisfied practical applications. The mule-shell layer strategy repotted in this paper can be extended to various mordancy hybrids to develop innovative dielectric nanocomposites. [ABSTRACT FROM AUTHOR]