Resource　multiple-life-cycle　(MLC)　recycling　process　is　a　complex　system　with　closed-loop　and　open-loop　recycling　interwoven　with　each　other,　which　has　recieved　vast　attention　in　recent　years.　Resource　MLC　recycling　has　a　cascading　effect,　one　recycling　process　will　have　an　impact　on　the　next　cycle,　and　ultimately　affect　the　overall　environmental　performance　of　the　social　system.　Policies　will　affect　the　flow　of　resource　MLC　recycling.　How　to　maximize　the　emission　reduction　effect　of　resource　MLC　recycling　through　policy　design　is　still　under　exploration.　Employing　MLC　recycling　of　China＇s　waste　PET　bottles　as　an　example,　this　paper　constructs　an　environmental　performance　accounting　method　based　on　MLCA,　and　simulates　the　overall　impact　of　various　policies　such　as　implementing　deposit　system,　promoting　recycled　materials,　strenghtening　environmental　regulation　and　enhancing　regeneration　technology　on　the　recycling　system　of　PET　bottles.　The　combined　policy　scenario　is　constructed　by　selecting　advantageous　strategies　that　can　effectively　give　full　play　to　the　strengths　of　each　policy　scenario.　From　2020　to　2040,　the　environmental　performance　loss　value　of　the　combined　policy　scenario　will　be　52.52%　of　the　baseline　scenario　without　policy　support,　and　the　cumulative　emission　reductions　of　wastewater,　waste　gas　and　solid　waste　will　be　0.98,　3.61　and　341.39　million　tonnes　respectively,　which　can　help　China　to　achieve　emission　reduction　targets　set　out　in　each　five-year　plan.　In　order　to　realize　the　combined　policy　scenario,　it　is　suggested　that　the　life　cycle　assessment　(LCA)　should　be　replaced　by　multiple　life　cycle　assessment　(MLCA),　the　effect　of　resource　saving　and　environmental　emission　reduction　in　the　recycling　process　should　be　accounted　as　accurately　as　possible,　a　top-level　management　organization　of　natural　resources　across　multiple　departments　should　be　established　as　soon　as　possible,　with　the　goal　of　maximizing　the　comprehensive　environmental　and　economic　benefits　of　MLC　processes.