Abstract: In this article, the SiO₂ nanoparticles were used as the core, 3-（trihydroxysilyl）-1-propane-sulfonic acid was covalently grafted on to the surface of SiO₂ via the dehydration reaction, and then polyoxyethylene octadecylamine（Ethomeen 18/25） was introduced to the surface of modified nanoparticles by electrovalent bonding.The organic/ inorganic hybrid nanomaterials exist as golden yellow transparent liquid at room temperature, that is called solvent-free nanofluids.The SiO₂ nanoparticles are monodisperse in the hybrid nanomaterials system.The content of SiO₂ nanoparticles reacheses up to 20wt%.The conductivity reacheses 10-3S/cm.It exhibits great potential application values in proton conductivity and the battery electrolyte and so on.