Abstract: The static compressive characteristics of glass micro-ballon/epoxy composites of three different densities were experimentally determined and their fractographs were analysed.In-site observations of the micro-structure during the fracture process were carried out.Experiments were done on Instron testing machine and SEM with its loading stage.The elastic constants and ultimate compressive strengths of the materials were determined.Based on the results of the micro-observations,the fracture patterns,deformation features, bondine conditions and the wav of fracture of the materials were discussed.