Hollow　glass　microbead/silicone　rubber　composite　coatings　were　prepared　to　improve　the　heat-resistance　and　mechanical　properties　of　silicone　rubber-based　composites,　using　CE　modified　SR　as　the　matrix　and　HGM　as　the　filler.　The　microscopic　morphology　and　thermal　stability　of　the　composites　were　characterized　by　scanning　electron　microscopy　(SEM)　and　thermogravimetric　analyzer　(TGA),　respectively.　The　results　showed　that　the　thermal　stability　of　the　composites　increases　with　the　increase　of　filler　content.　For　the　composite　sample　with　a　HGM　mass　content　of　16.7%,　the　initial　decomposition　temperature　(T-5)　is　408　degrees　C,　which　is　84　degrees　C　higher　than　that　of　silicone　rubber.　The　low　density　and　high　sphericity　of　HGM　make　it　easier　to　uniformly　disperse　in　the　polymer　matrix.　In　addition,　compared　to　silica,　which　is　commonly　used　as　an　inorganic　filler,　the　lower　thermal　conductivity　of　HGM　is　also　beneficial　for　achieving　better　thermal　shielding　effect.　It　is　confirmed　that　the　insufficient　thermal　stability　of　the　polymer　matrix　above　400　degrees　C　can　be　compensated　for　by　the　properly　dispersed　inorganic　fillers.　Therefore,　the　thermal　stability　of　the　composite　is　improved　by　the　synergistic　effect　of　modified　heat-resistant　matrix　and　inorganic　filler.