In this paper,graphite/BA/BMI and CCTO/BA/BMI composite is prepared by site polymerization.And the dielectric properties were studied.The dielectric constant(ε)and the dielectric loss(tan δ)of the graphite/BA/BMI composite increased significantly with the increase of graphite content.The percolation threshold of the composite reached maximum,while the mass fraction of graphite content is 11.975%,but maximum of tanδ was below 1.The ε and tanδ of CCTO/BA/BMI composite are also increased with the mass fraction...