Since　the　electrical　tree　initiation　voltage　of　the　silicone　rubber　decreases　significantly　at　high　temperatures,　it　is　significant　to　improve　the　electrical　treeing　resistance　of　silicone　rubber　at　high　temperatures　for　its　safe　and　stable　operation　as　an　insulating　material.　In　this　work,　a　voltage　stabilizer　named　the　2-Allyl-4,6-dibenzoyl　resorcinol　was　grafted　onto　the　silicone　rubber.　Then,　the　electrical　treeing　properties　of　the　silicone　rubber　grafted　with　a　voltage　stabilizer　were　measured　at　different　temperatures.　The　results　showed　that　the　electrical　tree　initiation　voltage　increased　by　14.5%,　42.5%,　and　46.0%　than　that　of　unmodified　silicone　rubber　at　30　°C,　50　°C,　and　70　°C,　respectively.　Besides,　the　propagation　structure　of　the　electrical　tree　was　prone　to　more　branches.　The　space　charge　distribution　exhibited　that　the　silicone　rubber　grafted　with　the　voltage　stabilizer　has　fewer　space　charge　injections.　The　trap　density　result　demonstrated　that　the　grafting　of　the　voltage　stabilizer　significantly　reduced　the　density　of　shallow　traps　inside　the　silicone　rubber　and　increased　the　energy　level　and　density　of　deep　traps.　The　improved　performance　at　high　temperatures　is　due　to　the　grafted　rigid　structure-benzene　rings　in　the　silicone　rubber,　reducing　the　degree　of　segment　relaxation　of　the　material　at　high　temperatures.　©　2022