Studying the evolution characteristics of damage strength and water absorption behavior of hollow glass beads solid buoyancy materials used for manned submersibles in the hyper-pressure environment will help people to understand the damage mechanism and induced mechanism of buoyancy materials for manned submersibles. To explore the in4uence mechanism of di5erent pressure, temperature, loading rate and load cycle times on deformation, failure, and water absorption behavior of solid buoyant materials, hydrostatic pressure tests of solid buoyant materials under di5erent conditions are conducted in this study. Based on the test data, the nonlinear characteristics of mechanical properties and water absorption behavior of two buoyant materials are obtained. *e results show that the water absorption characteristics of solid buoyant materials are a5ected by hydrostatic pressure, and the water absorption characteristics increase exponentially as the hydrostatic pressure increases. *e loading rate insigni7cantly a5ects the compressive strength and water absorption characteristics of both materials. Ambient temperature has a great in4uence on water absorption characteristics and failure strength of high-strength solid buoyant materials. After cyclic loading, the properties of buoyant materials decreased, and X-ray micro CTshowed that the internal hollow glass beads had a good shape and no signi7cant change in the glass beads breakage rate. *e change of solid buoyancy material properties is mainly due to the change of resin base material properties, resulting in material aging and performance attenuation. *e research results are helpful to further explore the fracturing evolution and water absorption behavior of solid buoyant materials and then play a guiding role in calculating the counterweight of manned submersible operation and performance prediction and maintenance of buoyant materials for manned submersibles.