The　degradation　of　electrical　insulation　is　mainly　attributed　to　local　defects.　Although　incorporating　organic　small　molecules　into　dielectric　polymers　promotes　the　insulation　strength,　accurate　suppression　of　defect　development　is　a　long-term　and　formidable　challenge.　Here　we　utilize　the　adaptive　charge　capture　methodology　to　achieve　precise　defect　suppression,　leading　to　a　123%　increase　in　the　initiation　voltage　of　electrical　trees　in　anthrone/cross-linked　polyethylene,　significantly　outperforming　existing　dielectric　polymers　and　polymer　composites.　A　significant　observation　is　the　confinement　of　charge　at　the　interface　between　the　anode　and　cross-linked　polyethylene　in　anthrone/cross-linked　polyethylene,　generating　a　reverse　inherent　electric　field　near　the　interface　and　reducing　the　internal　electric　field　strength　of　cross-linked　polyethylene　by　up　to　18%.　These　findings　not　only　open　avenues　for　further　exploration　of　materials　for　ultra-high　voltage　cables　but　also　play　a　crucial　role　in　the　commercialization　and　practical　application　of　organic　semiconductors　in　insulation　dielectrics.　©　The　Author(s)　2025.