The　formulation　composition,　physicochemical　properties　and　curing　process　of　the　epoxy　resin/alumina　composites　system　remarkably　affect　the　quality　of　UHV　large-sized　basin　insulations.　Consequently,　we　employed　the　non-isothermal　differential　scanning　calorimetry　method　to　study　the　curing　reaction　process　of　epoxy　resin/alumina　composites　containing　different　curing　agent　contents.　A　two-peak　curve　of　DSC　would　change　to　a　single-peak　curve　as　the　content　of　the　curing　agent　increased.　The　apparent　activation　energy　(Ea)　of　pre-stage　curing　of　all　samples　was　essentially　unchanged.　The　Ea　of　post-stage　curing　with　low　curing　agent　content　would　decrease　significantly　as　the　content　of　the　curing　agent　increased.　The　results　show　that　the　curing　catalytic　reaction　control　dominates　in　the　pre-stage　curing　process,　while　the　diffusion　control　and　the　reaction　control　have　competitive　effects　in　the　post-stage　curing.　The　actual　curing　process　accords　with　the　SB(m,　n)　model,　indicating　that　the　autocatalytic　reaction　plays　a　leading　role　in　the　curing　process.　©　2019,　High　Voltage　Engineering　Editorial　Department　of　CEPRI.　All　right　reserved.