We prepared the graphene oxide/epoxy resin nanocomposites by adding graphene oxide into epoxy matrix by the in-situ reduction method. The microstructures and functional groups of the nanocomposites were characterized

and their glass transition temperatures and broadband dielectric spectroscopy were also measured. The microstructure analysis shows that the combination of single-layer graphene oxide（SGO） and epoxy resins（ER） matrix is better than that of multilayered grapheme oxide（MGO） and epoxy resins matrix

which leads to the decrease of glass transition temperature of MGO/ER. The characteristics of charge carriers of composite at various temperatures were analyzed by using the complex conductance and modulus. The results reveal that when the temperature is higher than the glass transition temperature of the composites

the temperature dependence of the DC conductivity is in accordance with the Vogel-Fulcher-Tammann model. The conductance of ER and SGO/ER are mainly generated by the electronic jump conductance

in which the activation energies were 0.58 e V and 0.68 e V

respectively. The DC conduction of MGO/ER is also the electronic jump conduction during 120 ℃～150 ℃

in which activation is 0.98 eV. At above 160 ℃

the ion jump conductance begins to appear in MGO/ER

in which activation is 0.32 eV.