A graphene-silver nanofluid was prepared by using an electric wire explosion method to coat the graphene particles with silver nanoparticles. The number of times of explosion was set as a variable and the concentration of silver nanoparticles was made different. The properties of graphene - silver nanofluid were confirmed by using thermal conductivity and TEM and SEM. As a result, it was confirmed that graphene grains were attached to silver nanoparticles, and the change in thermal conductivity was confirmed based on distilled water