Being low at expansion coefficient, low at heat-conductivity coefficient, low at permittivity and at dielectric loss, good in corrosion resistance, and high at thermal-stability, fused silica is sometimes thought of as being the promising candidate for radome in aero-craft.In the present study, researchers reveal the influence of thermal-shock experiment on the material properties of fused silica radome via mechanical/thermal tests, scanning electron microscopy, and X-Ray diffraction. It is found that mechanical strength of fused silica is incremental after thermal-shock experiment. And the reason is that the occurrence of diffusion migration happens during the experiment to make the fused silica particles fused and recombined flakily. In addition, the effects of thermal-shock experiment on expansion coefficient, heat-conductivity, permittivity and dielectric loss are comparatively minor.