Geological　and　topographical　challenges　in　fault　zones　pose　significant　risks　to　the　structural　integrity　of　buried　pipelines.　Previous　studies　have　shown　that　continuously　buried　pipelines　using　loose　sand　as　backfill　material　experience　severe　damage　under　active　fault　displacement.　This　study　proposes　the　use　of　super-absorbent-　polymer　concrete　(SAPC)　as　an　alternative　trench　backfill　to　mitigate　structural　damage　in　buried　pipelines　subjected　to　reverse　fault　movement,　as　opposed　to　conventional　backfill　with　loose　sand.　This　study　begins　with　the　preparation　of　lightweight　porous　concrete　containing　large　super-absorbent-polymer　aggregates,　followed　by　mechanical　property　testing　to　establish　a　constitutive　model　of　SAPC.　The　SAPC　is　then　employed　to　backfill　the　trench　of　a　fault-crossing　pipeline.　A　finite　element　model　is　developed　to　analyze　the　pipeline-SAPC　trench-　soil　interaction　and　evaluate　the　performance　of　the　pipeline　when　the　trench　is　backfilled　with　SAPC.　Critical　parameters　such　as　SAPC　backfill　length,　overlying　thickness,　and　elastic　modulus　are　also　examined　for　their　effects　on　the　performance　of　a　buried　pipeline.　The　numerical　results　indicate　that　compared　with　conventional　backfill　with　loose　sand,　the　critical　reverse　fault　displacement　of　the　pipeline　can　generally　be　increased　by　over　100　%　after　using　SAPC　as　the　backfill　material.　Optimal　pipeline　performance　is　observed　when　the　SAPC　backfill　length　is　approximately　60　times　the　pipeline　diameter.　Besides,　a　thinner　overlying　SAPC　thickness　will　generally　enhance　the　performance　of　buried　steel　pipelines　under　reverse　fault　movement.　Additionally,　by　adjusting　the　sand-cement　ratio　and　SAP　volume　fraction,　a　SAPC　with　a　higher　elastic　modulus　can　slightly　improve　the　performance　of　the　fault-crossing　pipeline.