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In this paper, to fully explore the mechanical characteristic of hollow glass microspheres (HGM) composites in deep-sea environment, the compressive behavior of solid buoyancy materials under different temperature gradients and various stress states were studied by a triaxial test system. Through the analysis of experimental results, the glass transition temperature and energy absorption of the material were revealed. Such a content, will further be useful to construct the yield criterion and specialize the sensitivity of each parameter.