The　interface　between　two　insulations　in　cable　accessory　is　always　in　a　complex　environment　including　electricity　and　heat.　Besides　the　attachment　and　design　of　accessory,　the　silicone　grease　coated　on　interface　also　plays　an　important　role　in　keeping　the　reliability　of　the　interface.　So　far　there　has　little　research　about　the　swelling　effects　of　silicone　grease　on　silicone　rubber　and　its　influencing　factors.　In　this　paper,　based　on　the　silicone　grease　used　for　cable　accessories,　the　influences　of　the　heat　aging,　the　corona　discharge　aging,　and　the　aging　of　the　gas(ozone)　produced　by　corona　discharge　on　swelling　of　silicone　grease　on　the　surface　of　silicone　rubber　and　the　performance　of　swelled　silicone　rubber　were　studied.　The　results　showed　that　the　three　types　of　aging　differently　damaged　the　surface　microscopic　morphology　of　silicone　grease　and　silicone　rubber.　The　silicone　grease　of　samples　after　corona　aging　turned　dried　and　cracked,　and　a　number　of　dendritic　cracks　appeared　on　the　surface　of　the　silicone　rubber.　The　results　from　the　measurements　of　the　interfacial　breakdown　voltage　between　silicone　rubber　and　cross-linked　polyethylene　(SR/XLPE),　the　mechanical　performance,　and　infrared　spectroscopy　of　swelled　silicone　rubber　after　different　aging　show　that　corona　aging　will　obviously　reduce　the　interfacial　insulation　strength　and　mechanical　properties　of　silicone　rubber.　Additionally,　it　is　found　that　heat　aging,　gas　aging　and　corona　aging　all　accelerate　the　swelling　process　of　silicone　grease　into　rubber,　and　the　promoting　effect　will　reduce　sequentially.　Thermal　aging　increases　the　diffusion　rate　of　silicone　grease　in　silicone　rubber　by　increasing　the　relative　motion　between　silicone　grease　and　silicone　rubber　molecules.　Gas　aging　and　corona　aging　will　destroy　the　cross-linked　structure　of　silicone　rubber　by　strong　oxidants　such　as　ozone　and　high　energy　charged　particles　to　promote　the　swelling　of　silicone　grease.　©　2020,　High　Voltage　Engineering　Editorial　Department　of　CEPRI.　All　right　reserved.