Abstract: The graphene/nano-Ag(RGO/Ag) composite was prepared by a simple one-step chemical method, in which the hydrazine hydrate was used as a reductant. The microstructure and the components of the RGO/Ag composite were characterized by UV-vis, XRD, FTIR, SEM. Through analyzing heat flow and structure change, the influence of material structure and heat treatment on electrical conductivity of RGO/Ag composite was investigated. The results indicate that similar spherical Ag can be successfully synthesised companying with the reduction of silver nitrate and thus the RGO/Ag composite is prepared. The conductivity of the RGO/Ag composite increases significantly through adjusting Ag addition and heat treatment, when the loading amount of GO is below 50 wt%. The sheet resistance of RGO/Ag composite can be reached to 8 mΩ/□, when the loading amount of GO is 16 wt%. However, Ag content and heat treatment have much less effect on the conductivity of the resulting composite, when the loading amount of GO is more than 50 wt%.