Abstract: A material with low density and high strength was made by filling great amount of hollow glass micro-beads in bulk material epoxy resin, m-phenylenediamine (MPD) and 4, 4'-diaminodiphe-nylsulfone-(DDS) were chosen as the optimal modifier. The consistence between polymer and hollow glass beads and the mixing quantity of hollow glass beads were increased by modifying the surface of hollow glass beads. Through system optimization on all the factors influencing the surface treatment, the deep-sea buoyancy material was fabricated with a density of 0.61-0.75 g℃m^-3, a compression strength of 40-68.96 MPa and a less water absorption rate.