Epoxy resin is a basic resin material. Adding fumed silica to epoxy resin is completely different in structure from epoxy-based composite materials added with coarse-grained silica. Generally, coarse-grained silica is used as a reinforcement. Adding agent, it is mainly distributed in the chain of polymer materials, and nano-silica due to the serious lack of coordination on the surface, large specific surface area and surface lack of oxygen and other characteristics, make it show a very strong activity, it is easy It cooperates with the oxygen of the epoxy ring molecule to improve the bonding force between molecules. In the same fashion, a part of nano-sized silica particles are still distributed in the gaps of the polymer chain. Compared with coarse-grained silica particles, It exhibits high flow ripple properties, which greatly improves the strength, toughness and ductility of epoxy resin materials added with fumed nano-silica.