High strength solid buoyant material (SBM) is an important component of modern submersible technology. Hollow glass microsphere is one of the key materials for preparing SBM. In this paper, the authors first review hollow glass microsphere and SBM. Then, the research of the authors on hollow glass microsphere and SBM are also introduced. When the density of the hollow glass microsphere prepared by the group is as low as 0.21 g?cm–3, the broken particle ratio at 12 MPa of the microsphere is 40.6%. When the density of SBM is 0.52 g?cm–3, its compressive strength reaches 40 MPa.