Accurate　lifetime　prediction　of　transformer　oil-paper　insulation　is　of　great　significance　in　ensuring　the　safe　and　stable　operation　of　a　power　system.　In　this　paper,　the　internal　mechanism　relationship　between　interfacial　polarization　and　aging　oil-paper　insulation　is　analyzed　based　on　a　microscopic　dielectric　response　mechanism.　Based　on　a　mixed　polarization　model,　an　equivalent　circuit　topology　with　an　interfacial　polarization　branch　is　introduced　on　the　basis　of　an　extended　Debye　model,　and　the　application　of　interfacial　charge　polarization　characteristics　in　oil-paper　insulation　life　prediction　is　explored.　First,　the　universal　relaxation　polarization　law　behind　the　spectrum　changes　in　the　process　of　temperature　rise　is　analyzed,　and　the　recovery　voltage　polarization　spectrum　is　reconstructed　based　on　the　mixed　polarization　model.　Combined　with　the　influence　law　of　temperature　on　the　principal　time　constant　and　model　parameters,　a　calculation　method　for　the　activation　energy　of　oil-paper　insulation　in　a　single　temperature　test　is　proposed.　The　frequency-temperature　translation　factor　is　constructed　from　the　interface　polarization　capacitance.　Secondly,　the　change　rule　of　dielectric　loss　factor　with　the　deepening　of　aging　is　analyzed,　the　internal　relationship　between　loss　peak　shift　and　relaxation　time　of　interfacial　polarization　is　explored,　and　a　new　characteristic　parameter　in　frequency　domain,　the　interfacial　polarization　branch　pole　Ph2　is　refined　to　characterize　the　polymerization　degree　content　of　oil-paper　insulation.　Finally,　an　oil-paper　insulation　life　prediction　model　is　constructed　by　combining　interface　polarization　branch　pole　Ph2　,　frequency-temperature　translation　factor　and　a　loss　accumulation　dynamic　equation,　and　the　measured　data　of　a　transformer　of　different　operating　years　are　substituted　into　the　model　to　verify　its　effectiveness.　This　provides　a　new　idea　for　oil-paper　insulation　life　prediction.　©　2024　Power　System　Protection　and　Control　Press.　All　rights　reserved.