To　provide　a　reference　for　the　reduction　analysis　of　pavement　performance,　an　asphalt　pavement　with　different　base　types　was　taken　as　research　object　in　this　study　to　evaluate　the　feasibility　of　the　dynamic　backcalculation　in　pavement　performance　reduction.　The　field　deflection　measured　at　2010　and　2015　was　backcalculated　by　using　dynamic　and　static　approaches　to　study　the　various　tendencies　of　the　layer　property　during　the　service　life.　The　spectral　element　method　was　adopted　in　the　dynamic　approach　to　conduct　dynamic　viscoelastic　analysis　and　the　deflection　time-history　was　used　to　construct　the　optimization　objective　function.　The　complex　modulus　of　asphalt　layer　and　the　elastic　modulus　for　other　layers　were　obtained.　The　layered　elastic　theory　was　adopted　as　forward　analysis　engine　in　the　static　method,　and　the　deflection　basin　as　constrain　in　the　optimization　process,　and　the　elastic　moduli　for　all　layers　were　obtained.　The　dynamic　backcalculated　layer　property　was　employed　for　pavement　analysis　under　moving　vehicles.　The　strainress　at　the　bottom　of　the　layer　and　the　vertical　strain　at　the　mid　depth　of　the　asphalt　layer　were　calculated　to　study　the　various　tendencies　of　response　within　service　life.　Result　shows　that　the　layer　property　from　static　approach　is　fluctuant,　and　the　result　of　2015　is　even　greater　than　that　of　2010.　The　dynamic　backcalculated　layer　property　is　more　stable,　and　its　tendency　can　objectively　characterize　the　pavement　performance　reduction.　The　analyzed　response　based　on　dynamic　backcalculated　layer　property　shows　reasonable　variation　and　it　is　consistent　with　the　layer　property.　The　deflection　time-history　can　provide　more　constrains　in　optimization　process,　which　can　be　efficient　to　avoid　the　error　of　static　approach　due　to　the　modulus　compensating　phenomenon.　The　research　provides　an　efficient　and　convenient　routine　for　pavement　performance　reduction　analysis.　©　2022,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.